# Toolfyra — full tool reference > Complete details for all 351 free browser tools at https://toolfyra.com. Each entry: what it does, how to use it, and FAQ answers. Update: 2026-09-03. ## Age Calculator URL: https://toolfyra.com/age-calculator.html Category: Calculators Free age calculator: find your exact age in years, months and days from your date of birth — plus total days, weeks and your next birthday countdown. No signup. An age calculator converts a date of birth into an exact age in years, months and days. This is useful for government forms, school and job applications, visa documents and medical forms where an exact age is required. The calculation accounts for different month lengths and leap years. Everything runs locally in your browser. Q: How do I calculate my exact age? A: Enter your date of birth and the 'as of' date. The tool computes full years, remaining months and remaining days, adjusting for month lengths and leap years. Q: Is my date of birth stored anywhere? A: No. The calculation happens entirely in your browser — nothing is sent to any server. Q: Why do I need exact age in years, months and days? A: Many government, exam and immigration forms ask for exact age, not just the year. This tool gives you the precise breakdown. ## Percentage Calculator URL: https://toolfyra.com/percentage-calculator.html Category: Calculators Free percentage calculator: what is X% of Y, X is what percent of Y, and percentage increase or decrease. Instant results, mobile friendly. A percentage calculator solves the three most common percentage problems: finding a percentage of a number, finding what percentage one number is of another, and calculating percentage increase or decrease between two values. Useful for discounts, taxes, grades, tips, finance and data analysis. Q: How do I calculate X% of Y? A: Multiply Y by X and divide by 100 — or just use the first mode of this calculator. Q: How do I calculate percentage change? A: Subtract the old value from the new value, divide by the old value and multiply by 100. Mode 3 does it automatically. Q: Is it free? A: Yes — 100% free, no signup, and all math runs in your browser. ## EMI / Loan Calculator URL: https://toolfyra.com/emi-calculator.html Category: Calculators Free EMI calculator: compute monthly loan payments, total interest and total repayment for home, car or personal loans. Instant and private. An EMI (Equated Monthly Instalment) calculator shows the fixed monthly payment for a loan based on principal, annual interest rate and tenure. The formula is P × r × (1+r)^n ÷ ((1+r)^n − 1), where r is the monthly rate. Comparing EMIs before borrowing helps you budget and negotiate better terms. Q: What formula does an EMI calculator use? A: EMI = P × r × (1+r)^n / ((1+r)^n − 1), where P is principal, r is monthly interest rate and n is number of months. Q: Does a longer tenure reduce my cost? A: It reduces the monthly EMI but increases total interest paid. Try different tenures above to compare. Q: Is this the same as my bank's number? A: It is the standard reducing-balance EMI formula used by banks. Small differences can come from processing fees or insurance add-ons. ## BMI Calculator URL: https://toolfyra.com/bmi-calculator.html Category: Calculators Free BMI calculator for metric and imperial units. See your Body Mass Index and healthy weight category instantly. Private — runs in your browser. Body Mass Index (BMI) estimates body fat using weight and height: weight (kg) ÷ height² (m²), or 703 × lb ÷ in². The WHO categories are: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese. BMI is a screening tool, not a diagnosis — athletes and older adults may need other measures. Q: What is a healthy BMI? A: 18.5 to 24.9 is considered the healthy range for most adults. Q: Is BMI accurate for everyone? A: It is a general screening tool. It can misclassify muscular athletes and is not used for children (who use age-and-sex percentiles). Q: Is my data saved? A: No. Everything is calculated on your device. ## Word Counter URL: https://toolfyra.com/word-counter.html Category: Text Tools Free word counter: live count of words, characters (with and without spaces), sentences, paragraphs and reading time. Perfect for essays and SEO. A word counter helps writers, students and SEO professionals meet length requirements. This tool shows words, characters (with and without spaces), sentences, paragraphs, estimated reading time (200 wpm) and speaking time (130 wpm). All analysis is instant and stays on your device. Q: How is reading time calculated? A: Reading time uses an average of 200 words per minute; speaking time uses 130 words per minute. Q: Does it count characters without spaces? A: Yes — you get characters with spaces and characters without spaces. Q: Is there a length limit? A: No practical limit — it handles books worth of text smoothly. ## Case Converter URL: https://toolfyra.com/case-converter.html Category: Text Tools Free case converter: switch text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and kebab-case. One click, copy ready. A case converter transforms text between letter cases: UPPERCASE for headlines, lowercase for cleanup, Title Case for titles, Sentence case for paragraphs, plus programmer cases (camelCase, snake_case, kebab-case, CONSTANT_CASE) for code and URLs. Fix accidentally-caps-lock text in seconds. Q: What is Title Case? A: Every major word starts with a capital letter — used in headlines and titles. Q: What is kebab-case? A: All lowercase words joined by hyphens, e.g. my-page-url — common for URLs and file names. Q: Can I convert back and forth? A: Yes — just click any case button again on the new text. ## Text Toolkit URL: https://toolfyra.com/text-toolkit.html Category: Text Tools Free text toolkit: remove duplicate lines, sort, trim, remove empty lines, number lines, extract & validate emails and IP addresses. All in your browser. The text toolkit bundles everyday list and text operations: remove duplicate lines, remove empty lines, sort alphabetically, trim whitespace, number lines and reverse order. It can also extract email addresses and IPv4 addresses from any text and validate their format — handy for cleaning mailing lists, logs and datasets without spreadsheets. Q: Does removing duplicates keep the first occurrence? A: Yes — the first occurrence stays and later duplicates are removed. Q: How does email validation work? A: Each extracted address is checked against standard email format rules (name@domain.tld). It checks format, not whether the inbox exists. Q: Is my text uploaded? A: No — all processing happens locally in your browser. ## Password Generator URL: https://toolfyra.com/password-generator.html Category: Generators Free strong password generator: create random passwords up to 64 characters with letters, numbers and symbols. Cryptographically secure, works offline. Strong passwords should be long (14+ characters) and mix uppercase, lowercase, digits and symbols. This generator uses your browser's cryptographic random number generator (crypto.getRandomValues), which is far stronger than Math.random(). Generate, check the entropy estimate, and copy — the password never leaves your device. Q: How long should my password be? A: 16+ characters for important accounts; 64 is overkill but harmless. Length matters more than symbol soup. Q: Is this password generator safe? A: It uses crypto.getRandomValues in your browser — the password is never transmitted or stored. Q: What is entropy? A: Entropy (bits) measures guessing difficulty. 80+ bits is very strong; this tool shows the estimate live. ## QR Code Generator URL: https://toolfyra.com/qr-code-generator.html Category: Generators Free QR code generator: turn links, text, WiFi or contact info into a downloadable QR code PNG. Choose size and error correction. Private and instant. QR codes store links, text, WiFi credentials or contact details that phones can scan instantly. This generator creates static QR codes locally in your browser with adjustable size and error-correction level (higher correction survives logos and damage). The code never expires because it encodes your data directly — no redirect service involved. Q: Do these QR codes expire? A: No — the data is encoded directly in the image, so it works forever with no third-party service. Q: What size should I choose? A: 512px is fine for screens; 1024px+ for print. Q: What does error correction do? A: Higher levels (Q/H) let the code scan even if up to 30% is damaged or covered — useful if you overlay a logo. ## WhatsApp Link Generator URL: https://toolfyra.com/whatsapp-link-generator.html Category: Generators Free WhatsApp link generator: create wa.me click-to-chat links with a pre-filled message — without saving the number. Share or download as QR code. A WhatsApp click-to-chat link (wa.me/number) opens a chat with a phone number without saving it to contacts. Add a pre-filled message with the ?text= parameter. Businesses print these links on packaging, bios and ads so customers can start a chat in one tap. The generated link can also be shared as a QR code for offline use. Q: Do I need to include the country code? A: Yes — enter the full number in international format without + or dashes, e.g. 923001234567. Q: Can I pre-fill the message? A: Yes — any text you enter becomes the first message in the chat. Q: Does the link expire? A: Never. wa.me links are official WhatsApp format and work as long as the number is on WhatsApp. ## Image Compressor URL: https://toolfyra.com/image-compressor.html Category: Image Tools Free image compressor: shrink JPG, PNG or WebP files in your browser. Slide for quality or compress to a target size in KB. Nothing is uploaded. This compressor reduces image file size by re-encoding with adjustable quality, entirely in your browser — your photos never leave your device. Use the quality slider for general compression, or set a target size in KB when a portal demands a maximum (e.g. under 100 KB). The tool automatically finds the best quality that fits your target. Q: Are my images uploaded to a server? A: No. Compression uses the HTML canvas on your device — files never leave your browser. Q: How does 'target size' mode work? A: It binary-searches the quality level to get under your KB limit with the highest possible quality. Q: Which formats are supported? A: JPG, PNG and WebP input; output is JPG (best compression) or WebP. ## Image Resizer URL: https://toolfyra.com/image-resizer.html Category: Image Tools Free image resizer: resize photos to exact pixel dimensions with aspect-ratio lock. Choose JPG, PNG or WebP output. Private, no upload. Resizing changes an image's pixel dimensions without uploading it anywhere. Lock the aspect ratio to avoid stretching. Common uses: profile photos (e.g. 400×400), form uploads with dimension rules, email attachments and social media crops. Output formats: JPG (photos), PNG (graphics with text), WebP (smallest files). Q: Will resizing reduce quality? A: Downscaling keeps images sharp; heavy upscaling can look soft. The tool uses smooth browser scaling. Q: How do I keep proportions? A: Leave the aspect lock ticked — change one dimension and the other follows. Q: Is any image uploaded? A: No — resizing happens on your device using canvas. ## Image Converter (WebP → JPG) URL: https://toolfyra.com/image-converter.html Category: Image Tools Free image converter: convert WebP to JPG or PNG (and vice versa) in your browser. Fixes 'format not supported' upload errors. No upload, instant. Many government portals, job sites and older software still reject WebP images. This converter re-encodes any WebP, JPG or PNG into your chosen format right in the browser. For photos choose JPG; for graphics with transparency choose PNG. Note: HEIC (iPhone) conversion is coming soon. Q: Why do portals reject WebP? A: WebP is newer; many older upload systems only accept JPG/PNG. Converting to JPG fixes it. Q: Which output should I pick? A: JPG for photos (smaller), PNG for screenshots/graphics or when transparency is needed. Q: Is HEIC (iPhone photo) supported? A: HEIC support is on the roadmap — meanwhile, export from the iPhone as 'Most Compatible' or convert via this tool after changing format. ## Merge PDF URL: https://toolfyra.com/merge-pdf.html Category: PDF Tools Free PDF merger: combine multiple PDF files into one document, in your chosen order. 100% browser-based — files never leave your device. No signup. Merging combines several PDFs into a single document in the order you choose — useful for applications (cover letter + CV + certificates), invoices, or scanned documents. This tool uses PDF-Lib in your browser: files are never uploaded, which also makes it faster and private. Add files, arrange the order, merge and download. Q: How many PDFs can I merge? A: There is no hard limit — very large combined files may be slower on older phones. Q: Can I control the page order? A: Files merge top-to-bottom in the list. Remove and re-add to change order (drag-to-reorder is coming). Q: Are my documents uploaded? A: No. Merging happens locally with JavaScript — nothing leaves your device. ## JPG to PDF URL: https://toolfyra.com/jpg-to-pdf.html Category: PDF Tools Convert JPG and PNG images to a single PDF free — in your browser. Photos never upload, perfect for scans and documents. No watermark. Converting images to PDF creates a standard document from photos of papers, receipts, ID cards or notes — each image becomes one page in order. Because conversion is browser-based, private documents stay private. For best results photograph pages in good light; use our Document Scanner-quality tips: flat surface, no shadows. Q: What image formats can I convert? A: JPG and PNG (WebP is auto-converted to JPG first). Q: Can I reorder pages? A: Pages follow the file order in the list — remove and re-add to change it (drag reorder coming soon). Q: Is there a watermark? A: Never. Output is a clean PDF with your images only. ## PDF Page Extractor URL: https://toolfyra.com/pdf-page-extractor.html Category: PDF Tools Free PDF page extractor: pull selected pages (e.g. 1,3,5-8) into a new PDF. Browser-based, no upload, no signup. Extracting pages creates a new PDF containing only the pages you specify — ideal for sharing a section of a contract, submitting selected certificate pages, or trimming scanned documents. Repeating a page number duplicates it; reversed ranges reorder pages. Everything is processed locally. Q: How do I specify pages? A: Use commas and ranges: 1,3,5-8. Pages count from 1. Q: Can I reorder pages with this tool? A: Yes — the new PDF follows your entry order, e.g. 3,1,2. Q: Is the file uploaded anywhere? A: No — extraction runs in your browser with PDF-Lib. ## YouTube Thumbnail Downloader URL: https://toolfyra.com/youtube-thumbnail-downloader.html Category: Social & Video Free YouTube thumbnail downloader: paste any video link and view/download its thumbnails in all resolutions (HD 1280px and more). Fast, free, no signup. A YouTube thumbnail downloader reveals the thumbnail images of any public video in all available resolutions — from 120px up to maxres 1280px (when the uploader provided HD). Creators use it to study successful packaging, designers for references, and editors to check how their own video appears. Only public video thumbnails are accessible. Q: Which resolutions are available? A: default 120×90, medium 320×180, high 480×360, standard 640×480 and maxres 1280×720 — maxres only exists if the uploader uploaded HD art. Q: Why does maxres show 'not available' for some videos? A: The uploader never provided a high-resolution thumbnail. Use sd or hq instead. Q: Can I use someone's thumbnail? A: Thumbnails are copyrighted by their creators — use for research/reference, not republishing. ## Flight Compensation Checker (EU261) URL: https://toolfyra.com/flight-compensation-checker.html Category: Travel & Documents Free EU261 flight compensation checker: delayed 3+ hours, cancelled or denied boarding? Check if you're owed €250–600 and generate a ready claim letter. Under EU Regulation 261/2004 and UK261, passengers get €250–600 (or £) when a flight is delayed 3+ hours, cancelled with under 14 days' notice, or they're denied boarding — when the cause is within the airline's control. Amounts depend on flight distance. The 2026 reform shortened the claim window to 9 months, so check early. This tool estimates eligibility and generates a formal claim letter you can send to the airline yourself — keeping 100% of the compensation. Q: How much can I claim? A: €250 for flights under 1,500 km; €400 for 1,500–3,500 km; €600 over 3,500 km. UK amounts mirror this in pounds. Q: Which flights are covered? A: Flights departing from the EU/UK (any airline), and flights arriving in the EU/UK on an EU/UK airline. Q: What are 'extraordinary circumstances'? A: Weather, ATC strikes, security risks — the airline owes nothing for these. Technical faults and crew issues usually count in your favour. Q: How long do I have to claim? A: For disruptions before the 2026 reform, claim windows of 2–6 years applied in most EU/UK jurisdictions. New rules shorten this — check early. If the airline stalls ~2 months, escalate free via your country's Aviation ADR scheme — no claims company (they take 20–35%) is needed. Q: Should I take a voucher instead of cash? A: Airlines often offer travel vouchers (sometimes worth more than the €600 cash). Cash is your legal right for a qualifying 3+ hour delay — accept a voucher only if it genuinely suits you. Q: Is this legal advice? A: No — it is an informative estimate based on published regulation bands. ## Visa & DV Lottery Photo Checker URL: https://toolfyra.com/visa-photo-checker.html Category: Travel & Documents Free visa photo checker: validate your photo against US DV Lottery (600×600px, ≤240KB), US passport, Schengen and Canada specs — instantly in your browser. Wrong photos are the number one avoidable reason visa and DV Lottery applications get rejected. This checker validates your image against the exact technical rules: US DV Lottery (exactly 600×600px JPEG, ≤240KB), US passport/visa (2×2 in), Schengen (35×45mm) and Canada (50×70mm). A head-alignment guide shows the required framing. Photos are processed on your device only. Q: What are the exact DV Lottery photo rules? A: JPEG file, exactly 600×600 pixels, under 240KB, 24-bit color, white background, head 50–69% of image height, neutral expression. Non-compliant photos are the top disqualification reason. Q: Is my photo uploaded? A: No — checking runs entirely in your browser. The photo never leaves your device, so no third party (including us) can see or store it. Q: Are third-party photo checkers trustworthy? A: The US government offers its own photo tool (tsg.phototool.state.gov) for the final crop check. Use this checker to validate technical specs privately first — then the official tool if you want a second opinion. Never email your photo to unknown services. Q: What about EXIF metadata in my photo? A: The DV entry system does not inspect EXIF data, and this checker reads pixels only — it never stores anything. Re-saving your photo in any editor also strips most metadata if you prefer a clean file. Q: Does this guarantee acceptance? A: It validates all technical specs. Final approval is always the consulate's decision — also follow the framing guide for head position. ## Tip Calculator URL: https://toolfyra.com/tip-calculator.html Category: Money & Business Free tip calculator: add a tip percentage, split the bill between friends and see exactly what each person pays. Instant, no signup. A tip calculator works out the tip on a restaurant or service bill, adds it to the total and splits everything evenly across the group. Standard US tipping is 15–20% for restaurant service. Rounding per person avoids awkward cash moments. Q: How much should I tip? A: In the US, 15–20% is standard for restaurants; 10% is common in many other countries. The slider covers 0–50%. Q: Does it round per person? A: Yes — round-up option makes every share a whole amount where possible. Q: Can I split between any number of people? A: Yes, from 1 to 100. ## GST / VAT Calculator URL: https://toolfyra.com/gst-vat-calculator.html Category: Money & Business Free GST/VAT calculator: add tax to a net price or remove (reverse) tax from a gross price. Instant net, tax and gross amounts. GST/VAT calculators solve two problems: adding tax to a net price, and extracting the tax portion from a gross (tax-inclusive) price. Reverse calculation divides by (1 + rate), because the gross already contains the tax. Common rates: India GST 5/12/18/28%, UK VAT 20%, EU VAT 17–27%, Pakistan GST 18%. Q: How do I remove GST from a total? A: Divide the gross amount by (1 + rate/100). Example: remove 18% from 1180 → 1180 / 1.18 = 1000 net, 180 tax. Q: Which rates are supported? A: Any custom rate — preset buttons for common ones (5%, 12%, 18%, 20%, 28%) are provided. Q: Does it work for VAT too? A: Yes — VAT, GST and sales tax all use the same percentage math. ## Profit Margin Calculator URL: https://toolfyra.com/profit-margin-calculator.html Category: Money & Business Free profit margin calculator: compute margin %, markup % and profit from cost and selling price — or find the right price for a target margin. Margin is profit as a share of the selling price; markup is profit as a share of cost. Mixing them up is the classic pricing mistake: a 50% markup gives only a 33% margin. This calculator does both directions — analyze an existing price, or reverse-engineer the price needed to hit a target margin. Q: What is the difference between margin and markup? A: Margin = profit ÷ selling price. Markup = profit ÷ cost. A 100% markup equals a 50% margin. Q: What is a good profit margin? A: It varies by industry — retail often runs 20–50% gross margin; services can be much higher. Q: Can I compute the price for a target margin? A: Yes — enter cost and the margin you want; the price field calculates it. ## Compound Interest Calculator URL: https://toolfyra.com/compound-interest-calculator.html Category: Money & Business Free compound interest calculator: project savings growth with yearly/quarterly/monthly compounding and regular contributions. Year-by-year table. Compound interest pays interest on interest. The formula is A = P(1 + r/n)^(nt) plus the future value of regular monthly contributions. Compounding frequency matters: monthly compounding beats yearly at the same nominal rate. This calculator shows a full year-by-year growth table so you can see the curve accelerate. Q: Which compounding frequency should I choose? A: Match your real product: savings accounts usually compound monthly; many bonds/certificates annually. Q: Do contributions count as start or end of month? A: This calculator adds them at month-end (ordinary annuity) — the standard convention. Q: Is inflation included? A: No — results are nominal. Subtract expected inflation (~2–3%) to think in real terms. ## Invoice Generator URL: https://toolfyra.com/invoice-generator.html Category: Money & Business Free invoice generator: create a professional invoice with items, tax and totals — then print or save as PDF from your browser. No signup, no watermark. This invoice generator builds a professional invoice in your browser: business and client details, unlimited line items, tax percentage, notes and live totals. When you print (Ctrl/Cmd+P or the button), choose 'Save as PDF' as the destination — the invoice prints clean without any website furniture. Nothing is uploaded anywhere. Q: How do I save the invoice as a PDF? A: Click Print / Save PDF, then choose 'Save as PDF' as the printer destination in the dialog. Q: Can I add my logo? A: Yes — paste a hosted image URL into the logo field, or add it later in your PDF editor. Q: Is it really free with no watermark? A: 100% free, no watermark, no signup — your data never leaves your browser. ## TDEE & Calorie Calculator URL: https://toolfyra.com/tdee-calorie-calculator.html Category: Health & Fitness Free TD