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 any birth date, plus total days lived and a live countdown to your next birthday. Free, instant, and completely private.
Area Converter
Convert area units instantly - square meters, square feet, square yards, acres, hectares, ares, and more, metric and imperial. 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. Free tool that runs entirely in your browser, no sign-up.
BMI Calculator
Calculate your Body Mass Index from height and weight, in metric or imperial units, and see your weight category plus a healthy weight range. Free, instant, and private.
Compress Image
Reduce an image's file size in JPEG, PNG, WebP, or AVIF format, using a compression profile or a custom quality level, with minimal quality loss. Free, fast, no sign-up.
Compress PDF
Reduce a PDF's file size by re-serializing its internal structure more efficiently, without losing any content. Fast, free PDF compression, no sign-up or software required.
Crop Image
Crop an image to any rectangular region by dragging a selection box directly on the image itself, then download the cropped result. Free, fast, and easy - no sign-up required.
Currency Calculator
Convert between world currencies using live exchange rates or a rate of your own, and create custom alerts for the currency pairs you're tracking. Free, accurate, no sign-up.
Delete PDF Pages
Remove specific pages from a PDF file while keeping every other page fully intact and in its original order. Fast, free, and secure - no sign-up or software installation.
Extract PDF Pages
Pull specific pages out of a PDF into a brand new, separate document, choosing exactly which pages to extract. Fast, free, and secure - no sign-up or software required.
Grammar Check
Automatically detect and fix grammar, spelling, punctuation, and capitalization errors in your writing, while preserving your original tone and meaning. Free AI-powered tool.
Hash Generator
Generate MD5, SHA-1, SHA-256, or SHA-512 hashes in hexadecimal or base64 format, and compare your result against a hash you already have. Free, instant, runs in your browser.
Image to PDF
Combine up to 20 images into a single PDF document, one image per page, with your choice of page size and orientation. Free, fast, and secure - no sign-up or software needed.
JSON Formatter
Format, minify, or validate JSON instantly in your browser, with clear error messages and optional alphabetical key sorting. Free developer tool - nothing is ever uploaded.
Length Converter
Convert length instantly between metric and imperial units - millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. Free, accurate, no sign-up needed.
Loan Calculator
Calculate a loan's monthly payment, total interest, and total repayment from the principal, rate, and term, with a full amortization schedule. Free, instant, no sign-up.
Merge PDF
Combine up to 50 PDF files into a single document, in exactly the order you upload them, with no quality loss. Fast, free, and secure - no sign-up or software required.
Mortgage Refinance Calculator
Compare your current mortgage against a refinance offer - see your monthly savings, break-even timeline, and total lifetime interest saved. Free calculator, instant results.
PDF to Image
Convert every page of a PDF into a PNG or JPEG image at a custom resolution, from 72 to 600 DPI for screen or print use. Fast, free conversion, no sign-up or software needed.
PDF to Word
Extract the text from a PDF into an editable Word (.docx) document in seconds, ready to edit anywhere. Free, fast conversion - no sign-up or software installation needed.
Percentage Calculator
Calculate percentages, percentage change, discounts, tax, tips, and profit margin versus markup - nine calculation modes in one free calculator. Instant, no sign-up needed.
Regex Tester
Test a regular expression against any string and instantly see every match, its exact position, and named or numbered capture groups. Free regex tester, no sign-up required.
Remove Background
Automatically detect and remove an image's background, leaving just the subject on a clean, transparent background, ready to download as a PNG. Free, fast, no sign-up needed.
Resize Image
Resize any image to exact pixel dimensions, choosing fit, fill, or stretch modes to control the aspect ratio. Free image resizer, fast results, no sign-up required.
Rewrite
Rewrite any text in a different style - professional, casual, formal, academic, marketing, or simplified - while keeping the original meaning intact. Free AI-powered tool.
Rotate PDF
Rotate every page of a PDF, or only the pages you select, by 90, 180, or 270 degrees in seconds. Fast, free, and secure PDF rotation - no sign-up or software installation.
Split PDF
Split a single PDF into multiple separate files using the exact page ranges you choose, in seconds. Fast, free, and completely secure - no sign-up or installation needed.
Summarizer
Summarize long text into a short summary, a bulleted list of key takeaways, or a detailed paragraph, instantly and in the level of detail you need. Free AI-powered summarizer.
Temperature Converter
Convert temperature instantly between Celsius, Fahrenheit, and Kelvin using standard conversion formulas, accurate to any decimal precision. Free to use, no sign-up needed.
Translator
Translate text into virtually any language, with automatic source-language detection or a specific source language you choose yourself. Free AI-powered translation tool.
UUID Generator
Generate one or up to 1000 cryptographically random version-4 UUIDs instantly, with optional uppercase formatting and no-hyphen output. Free, no sign-up, nothing is stored.
Volume Converter
Convert volume units instantly - milliliters, liters, cubic meters, US and UK fluid ounces, cups, pints, quarts, and gallons. Free, accurate, no sign-up or download required.
Watermark
Add a custom text watermark to any image with full control over its position, size, opacity, rotation, and color. Free watermarking tool, fast results, no sign-up required.
Weight Converter
Convert weight instantly between metric and imperial units - milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and US/UK tons. Free and accurate, no sign-up.
Word Counter
Count words, characters, sentences, and paragraphs in any text, plus estimated reading and speaking time - calculated instantly and locally, with no AI involved at all.
Word to PDF
Convert a Word (.docx) document into a PDF file with good fidelity for typical documents and formatting. Free, fast conversion - no sign-up or software installation required.
YouTube Channel ID Finder
Find any YouTube channel's real UC... channel ID from its @handle, custom URL, or channel page link, instantly and for free. No sign-up, no API key, and no rate limits.
YouTube Chapter Generator
Turn rough timestamp notes into a clean, ready-to-paste YouTube chapter list, automatically validated against YouTube's own chapter requirements before you publish. Free tool.
YouTube Embed Generator
Generate a customizable YouTube embed code with autoplay, loop, hidden controls, a custom start time, and YouTube's privacy-enhanced nocookie mode. Free, instant, no sign-up.
YouTube Tag Generator
Generate relevant, SEO-friendly YouTube video tags from your video's topic, keywords, and description using AI, to improve discoverability. Free to use, instant results.
YouTube Thumbnail Downloader
Download a YouTube video's thumbnail in the highest resolution available, from a watch URL, youtu.be link, Shorts link, or bare video ID. Free, instant, no sign-up needed.
YouTube Timestamp Link Generator
Generate a YouTube link that jumps straight to an exact timestamp, in both short youtu.be and full youtube.com/watch formats, from any video URL or ID. Free and instant.
YouTube Title Generator
Generate compelling YouTube video title ideas from your topic and keywords, in curiosity, how-to, listicle, question, or direct tones, using AI. Free tool, five title options.
YouTube Transcript Downloader
Download a YouTube video's transcript as plain text or with timestamps, from any public video URL or ID, auto-generated captions included. Free, instant, no sign-up needed.
YouTube Video Downloader
Download a YouTube video as a single MP4 file straight from any public video URL or ID, no software or browser extension required. Free, instant, and completely sign-up free.