125 tools · free forever · no BS
Tools that don't phone home.
Free tools for PDFs, images, audio and more that run entirely in your browser - the files you add are never uploaded.
Images
Blur Brush
Interactive tool to selectively blur parts of images for privacy
Color Brush
Pick a color from an image with an eyedropper, then brush it onto other areas to touch up or cover details
Rotate Image
Rotate images in 90° increments
Resize Image
Resize an image to exact width and height
Crop Image
Crop an image to a selection you draw
LinkedIn Image Editor
Create a LinkedIn profile image with custom text overlay
Draw Arrow
Draw arrows on images
Smooth Draw
Sketch with smooth ink; rough circles, boxes and arrows snap to clean shapes
Image Converter
Convert one or many images, including HEIC iPhone photos, to JPG, PNG, WebP, or AVIF in your browser
HEIC to PNG
Convert HEIC/HEIF iPhone photos to PNG
PNG to JPG
Convert PNG images to smaller JPG files
WebP to JPG
Convert WebP images to JPG for apps that can't open WebP
Flip Image
Flip images horizontally or vertically, supporting SVG files
Image Compressor
Compress (condense) images while maintaining dimensions with customizable quality
Image Compare
Upload two images and create side-by-side comparison for social media
Handwritten Note
Turn typed text into a handwritten-style note image, with your choice of font and colors
Gradient Background
Add a gradient background and white caption text below your image
Strip EXIF
Remove EXIF metadata - including GPS location - from a photo before you share it
Before You Post - Photo Privacy CheckAI
Find location data, faces, card numbers, emails and API keys in a photo or screenshot, then clean it in one click
HEIC to JPG
Convert HEIC/HEIF iPhone photos to JPG
Background RemoverAI
Cut the background out of a photo with in-browser AI
Object & Text RemoverAI
Brush over objects, people or text and AI fills the gap
AI Image UpscalerAI
Upscale a photo 2x or 4x with in-browser AI, sharper than a resize
Blur FacesAI
Detect and blur every face in a photo automatically
Passport Photo MakerAI
Make passport and ID photos at the right size for your country
PDFs
PDF Merger
Merge multiple PDF files
Split PDF
Split a PDF into multiple files by page number
PDF to CSV
Extract a table from a text-based PDF into a CSV file, best-effort
Reorder PDF Pages
Reorder the pages of a PDF by thumbnail, then export
Rotate PDF
Rotate every page of a PDF in 90° increments
Add PDF Page Numbers
Add page numbers to the bottom of every page in a PDF
Watermark PDF
Stamp a diagonal text watermark across every page of a PDF
PDF to JPG
Convert every page of a PDF into a JPG image
Crop PDF
Crop every page of a PDF to a selection you draw
Highlight PDF
Highlight text in a PDF in yellow, green, blue or pink, or box areas on scanned pages
Protect PDF
Add a password to a PDF with AES-256 encryption
Extract PDF Pages
Extract specific pages from a PDF file
Remove PDF Password
Unlock a password-protected PDF file
PDF to AudioAI
Turn a PDF into an audiobook: listen or download an MP3
Compress PDF
Shrink a large PDF's file size for easier sharing
JPG to PDF
Combine JPG, PNG and other images into one PDF
Word to PDF
Convert DOCX, DOC, ODT and RTF documents to PDF
PDF to Word
Turn a PDF into an editable Word (DOCX) document
PDF to PNG
Turn each PDF page into a lossless PNG image
Edit PDF Text
Click any text in a PDF and change it, in the same font
Sign PDF
Draw, type or upload a signature and place it on a PDF
Redact PDF
Permanently remove text and areas from a PDF
OCR PDFAI
Make a scanned PDF searchable and selectable with OCR
Translate PDFAI
Translate a PDF's text on-device with Chrome's translator
PDF to Handwriting
Turn a PDF or typed text into handwritten-looking notes, on its own layout or notebook paper
PDF Slides to Anki
Turn lecture slides into an Anki deck with slide images
Fill PDF Form
Fill in PDF form fields and save the completed form
Audio & Video
MP4 to MP3
Extract the audio from a video as MP3, M4A or WAV, in your browser
Transcribe AudioAI
Turn speech into text with timestamps, in your browser
Microphone Test
Check your mic with a live level meter and a 5-second playback
Webcam Test
Check your camera's real resolution, frame rate and picture
Voice Recorder
Record from your microphone and download it, or transcribe it
Remove Background NoiseAI
Clean up a noisy voice recording without uploading it
Text to SpeechAI
Read any length of text aloud with natural voices, as MP3 or WAV
Voice / Music SplitterAI
Separate a voice track from background music in your browser
Remove VocalsAI
Make a karaoke or instrumental version of any song
Acapella ExtractorAI
Get the vocals (acapella) from any song with AI
BPM & Key Finder
Find a song's tempo and musical key, with Camelot codes
Change Song Key & Tempo
Move a song to a new key or speed, independently
Stem SplitterAI
Split a song into vocals, drums, bass and other
Lyrics to LRCAI
Make a synced .lrc lyrics file from a song
Video to TextAI
Transcribe the speech in a video to text and subtitles
Compress Video
Shrink a video to fit Discord, WhatsApp or email
Trim Video
Cut the start and end off a video, or crop it to 9:16
Trim Audio
Cut the start and end off an MP3, M4A or WAV, losslessly
Merge Audio
Join MP3, M4A or WAV files into one, losslessly when they match
Make Audio Louder
Boost the volume of an MP3, M4A or WAV without clipping
Loudness Normalizer
Measure LUFS and normalize to podcast, Spotify or ACX levels
Fade In & Out
Add a smooth fade-in and fade-out to an audio file
Slowed + Reverb
Make a slowed + reverb, sped up or nightcore version of a song
Remove Silence
Cut long pauses out of a recording, with a preview of every cut
Stereo to Mono
Mix stereo to mono or keep one side, and fix one-ear audio
Split Audio
Split audio into parts by count, length, silences or times
Video to GIF
Turn a clip from a video into a GIF or animated WebP
Blur Faces in VideoAI
Find, track and blur every face in a video automatically
Text & Data
JSON Formatter
Format and prettify JSON strings
Base64 Decoder
Decode Base64 to text, images or files, or encode text and files to Base64
JWT Decoder
Decode a JSON Web Token, see when it expires, and verify its signature
Markdown Live Preview
Write Markdown and see it rendered side by side, then export HTML or .md
Regex Tester
Test a JavaScript regular expression with live matches, groups and replace
De-identify TextAI
Find and replace names, dates, phone numbers and record numbers before you share text
File Hash Checker
Get SHA-256, SHA-1, SHA-512 or MD5 of any file and check it against the expected hash
CSV Preview
Paste CSV or TSV data and preview it as a scrollable table
Code Snippet
Create and share code snippets
JSON & Text Diff
Compare two blocks of text or JSON line by line and see what changed
Word & Character Counter
Count words, characters and sentences, with reading time, keyword density and X, LinkedIn, Instagram and SMS limits
Lorem Ipsum Generator
Placeholder text by paragraphs, sentences, words or list items, as plain text or HTML
Image to Text (OCR)AI
Extract text from screenshots, photos and scans
SEO
Domain Info
Lookup domain registration details, age, and ownership information
Schema Markup Checker
Check a page's structured data against Google's rich result rules, and spot JavaScript-only pages
Link Preview Checker
See how a link looks when shared on WhatsApp, LinkedIn, X, Slack and more, and check og:image and Open Graph tags
Redirect Checker
Follow every redirect hop of a URL with status codes and timing, and catch chains, loops and 302s that should be 301s
Sitemap Validator & Generator
Check a sitemap.xml or index against sitemaps.org and Google's rules, or build one from a list of URLs
SERP Snippet Preview
Preview a title and meta description as a desktop or mobile search result, cut by pixel width
Alt Text GeneratorAI
Draft alt text for one image or a batch with in-browser AI, then edit and copy as HTML or CSV
UTM Link Builder
Add utm_source, medium and campaign tags to links for GA4, one at a time or from a CSV
Lookups
AI Model ID Lookup
Search and copy the exact API model ID, alias, and pricing for GPT, Claude, Gemini, Grok and DeepSeek models
AWS Edge Locations
Lookup AWS CloudFront edge location details by code
GPU & CPU Info
See which GPU your browser reaches, whether WebGPU really works, and your CPU and memory limits
Math & Visual Learning
Derivative Explorer
Drag a point, compare secant and tangent slopes, and trace the derivative.
Integral Explorer
Refine signed rectangles and compare left, right, midpoint and trapezoid rules.
Derivative ↔ Integral Explorer
Link function height to the slope of its accumulated signed area.
Taylor Series Animator
Animate polynomial orders, move the expansion center and explore convergence.
Solids of Revolution
Revolve a region in 3D and compare disk, washer and shell volume estimates.
Gradient Descent Playground
Move a ball across cost curves and explore learning rates, overshooting and local minima.
Weighting Lens
Explore exponential weighting, rotating contributions and the region of convergence.
Laplace System Builder
Connect spring, damper, integrator and delay blocks and animate their response.
Convolution Machine
Slide two signals, see their overlap area and connect convolution to Laplace multiplication.
Guess the Response
Predict decay, ringing and growth from poles, then reveal the animated response.
Utilities
AI Cost Calculator
Calculate how much it costs to use popular AI models based on token usage
Invoice Generator
Make a PDF invoice with your logo, line items, tax and payment details
AI Model PlaygroundAI
Run Hugging Face models for text, vision and audio right in your browser - pick a task, pick a model, try it
Age Calculator
Calculate exact age in years, months, and days from a birth date
Todo List
Simple and beautiful todo list with local storage
Cron Checker
Enter a cron expression to see the next 10 execution times
QR Code Generator
Turn text or a URL into a scannable QR code
QR Code Reader
Read a QR code from a screenshot or a photo of a poster
Password Generator
Generate strong, random passwords with custom rules
P2P File Share
Send any file straight from your browser to another one - no upload, no size limit
Fit to Send
Check whether a file fits WhatsApp, Gmail, Outlook or Discord, and shrink it if it doesn't
0 bytes
Runs in your browser
Client-side tools process files locally - nothing is uploaded to a server.
0 sign-ups
No account, no wait
Open a tool and use it immediately. No sign-up flow between you and the task.
1 developer
Built by one developer
No VC roadmap, no growth team - just tools built to solve real, everyday problems.
Why "No BS"
| Most free tools | Candid Tools | |
|---|---|---|
| Account required | Usually | Never |
| File ever leaves your browser | Often | No - client-side only |
| Price after a free tier | Hidden, then a paywall | Free tools stay free, forever |
| Ads / tracking on the tool page | Common | None |
Frequently asked questions
Is Candid Tools actually free, or is there a paid tier?
Free, full stop. No premium tier, no feature paywall, no usage limit that unlocks with a card number.
Do I need to create an account?
No. Open any tool and use it immediately - there's no sign-up flow between you and the task.
What happens to the files or text I use in a tool?
For nearly every tool, processing runs entirely in your browser - nothing is uploaded to a server. The exceptions are the tools that have to reach the internet for you: Domain Info, Schema Markup Checker, Link Preview Checker, Redirect Checker and Sitemap Validator & Generator. They send the domain or URL you enter (never a file) to our server, which looks it up or downloads that page and doesn't store it. Each one says so on the tool itself, and where one also lets you paste code or upload a file, that part stays in your browser.
How is this different from other free online tools?
Most "free" tools upload your file to a server, process it there, and send it back - and often gate real usage behind an account or a paywall once you're hooked. Everything here that can run client-side does, and the free tools stay free.
If it's free, what's the catch - how do you make money?
There isn't a hidden catch on the tools themselves. The site runs on lightweight product analytics (PostHog) to see what's useful, plus an advertising pixel while a campaign is running - the privacy page says which of those is live right now.
Can I request a tool that doesn't exist yet?
Yes - email hello@candidtools.com. Tools get added because they're useful, not because they tested well with a growth team.
Have a tool in mind, or something not working?
If there's a tool you keep wishing existed, or you hit a bug, tell me and I'll look at it.