All Tools
Browse every free tool on Supabus, organized into seven categories - search or filter by category to find exactly what you need.
Age Calculator
Calculate exact age in years, months, and days from a birth date, plus total days lived and days until your next birthday.
Area Converter
Convert area units instantly - square meters, square feet, acres, hectares, and more. Free, accurate, no sign-up required.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to text instantly, with an optional URL-safe variant for use in links.
BMI Calculator
Calculate your Body Mass Index from height and weight, metric or imperial, and see your weight category instantly.
Compress Image
Reduce an image's file size in JPEG, PNG, WebP, or AVIF, using a compression profile or a custom quality level.
Compress PDF
Reduce a PDF's file size by re-serializing it with a more efficient internal structure. Fast, free, no sign-up.
Crop Image
Crop an image to any rectangular region by dragging a selection directly on the image. Free, no sign-up required.
Currency Calculator
Convert currencies using live exchange rates or your own rate, and set rate alerts for the pairs you're watching.
Delete PDF Pages
Remove specific pages from a PDF while keeping everything else intact. Fast, free, no sign-up required.
Extract PDF Pages
Pull specific pages out of a PDF into a new, separate document. Fast, free, no sign-up required.
Grammar Check
Automatically fix grammar, spelling, punctuation, and capitalization errors while keeping your original tone.
Hash Generator
Generate MD5, SHA-1, SHA-256, or SHA-512 hashes in hex or base64, and compare the result against a hash you already have.
Image to PDF
Combine up to 20 images into a single PDF, one image per page, with your choice of page size. Free, no sign-up.
JSON Formatter
Format, minify, or validate JSON instantly, with clear error messages and optional alphabetical key sorting.
Length Converter
Convert between metric and imperial length units instantly - millimeters to miles and everything between. Free, accurate, no sign-up required.
Loan Calculator
Calculate a loan's monthly payment, total repayment, and total interest from the principal, interest rate, and term.
Merge PDF
Combine up to 50 PDF files into a single document, in the order you upload them. Fast, free, no sign-up required.
Mortgage Refinance Calculator
Compare your current mortgage to a refinance offer - see monthly savings, break-even time, and lifetime interest savings.
PDF to Image
Convert PDF pages to PNG or JPEG images at a custom resolution, from 72 to 600 DPI. Fast and free to use.
PDF to Word
Extract text from a PDF into an editable Word (.docx) document. Fast, free, no sign-up required.
Percentage Calculator
Calculate percentages, discounts, tax, tips, and profit margin vs. markup - one calculator, nine calculation modes.
Regex Tester
Test a regular expression against any string and see every match, its position, and named capture groups instantly.
Remove Background
Automatically remove an image's background, leaving the subject on a transparent background. Free, no sign-up.
Resize Image
Resize an image to exact dimensions, with fit, fill, or stretch modes for handling the aspect ratio. Free, no sign-up.
Rewrite
Rewrite text in a different style - professional, casual, formal, academic, marketing, simplified, and more.
Rotate PDF
Rotate all or specific pages of a PDF by 90, 180, or 270 degrees. Fast, free, no sign-up required.
Split PDF
Split a PDF into separate files by the page ranges you choose. Fast, free, no sign-up required.
Summarizer
Summarize long text into a short summary, bullet points, key takeaways, or a detailed paragraph, instantly.
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin instantly using standard conversion formulas. Free and accurate, no sign-up required.
Translator
Translate text into any language, with automatic source-language detection or a language you specify.
UUID Generator
Generate one or up to 1000 cryptographically random UUIDs (v4) instantly, with optional uppercase and no-hyphen formatting.
Volume Converter
Convert volume units instantly - milliliters, liters, gallons, and cups, metric and imperial. Free, accurate, no sign-up.
Watermark
Add a text watermark to an image with full control over position, size, opacity, and color. Free, no sign-up.
Weight Converter
Convert weight and mass units instantly - milligrams to stone, metric and imperial. Free, accurate, no sign-up required.
Word Counter
Count words, characters, sentences, and paragraphs, plus reading and speaking time - instantly, no AI involved.
Word to PDF
Convert a Word (.docx) document into a PDF, with good fidelity for typical documents. Free, no sign-up.
YouTube Thumbnail Downloader
Download a YouTube video's thumbnail image in the highest resolution available, from any video URL or ID.
YouTube Transcript Downloader
Download a YouTube video's transcript as plain text, from any video URL or ID.