Free online tools that keep your files on your computer
John's page of small, free utilities for PDFs, images, data and code. No ads and no sign-up, and nearly all of them do their work inside this tab, so the files you open never leave your machine and there is no upload limit to run into. Why that matters.
Documents & textView all
PDF Toolkit
Merge, split, edit, annotate, redact, compress and password-protect PDFs — nothing leaves your browser.
Sign PDF
Draw, type or upload your signature, place it on a PDF, fill in its form or add fillable fields, and save — no account, no upload.
XFA Form Filler
Open a PDF form that only says "Please wait..." in your browser, fill it in, and save it for Adobe Reader or as an ordinary PDF.
Repair Office File
Fix a Word, Excel or PowerPoint file that will not open, and get back everything that can be saved, without uploading it.
Compare PDFs
See what changed between two versions of a PDF - every word added or removed, and every page that looks different.
EPUB Reader
Open an ebook from Gutenberg or any DRM-free source and read it here, with a contents list and adjustable text size.
DOC Viewer
Open .doc and .docx files, make quick edits with a basic toolbar, then download as .doc, HTML or text — all in your browser.
PowerPoint Viewer
Open a .pptx without PowerPoint: see every slide and its notes, play it full screen, or save it as a PDF.
HTML to Markdown
Paste a chunk of a web page and get clean Markdown back — headings, links, lists, code and tables.
Markdown Editor
Write Markdown with a live HTML preview, then copy or export to HTML or PDF.
OCR Toolkit
Pull the text out of an image or scanned PDF, or make the PDF searchable — the recognition runs in your browser, so the file is never uploaded.
Audio to Text
Transcribe a recording or a video's sound with Whisper, in the browser — then save it as text, or as SRT or VTT subtitles.
Subtitle Sync Fixer
Subtitles early, late or drifting? Shift or resync an .srt or .vtt, check it against the video, and convert between the two.
Calendar Viewer
Open an .ics invitation or calendar export and actually read it — times, places, attendees and repeats.
MSG & EML Viewer
Open an Outlook .msg or an .eml without Outlook — read it, save the attachments, or print it to PDF.
PST Viewer
Open an Outlook .pst or .ost mailbox without Outlook - read every email, search by subject, sender or recipient, save attachments, export to .eml or .mbox.
OLM Viewer
Open an Outlook for Mac .olm archive on Windows or anywhere without Outlook - browse the folders, read every email, save attachments, export to .eml or .mbox.
WhatsApp Chat Viewer
Read an exported WhatsApp chat as a real conversation, with photos and voice notes, search it and save it as a PDF.
iPhone Backup Viewer
Open an iTunes or Finder iPhone backup, even encrypted: read messages, see photos, contacts and calls, and save them.
Publisher Viewer
Open a Microsoft Publisher .pub file without Publisher, see every page, and save it as a PDF.
OneNote Viewer
Open .one sections and whole notebooks without OneNote, print them, or save them as HTML or Markdown.
CHM Viewer
Open Windows .chm help files on a Mac, Linux or Chromebook: contents, index and search, and save as PDF or Markdown.
Pages, Numbers & Keynote Viewer
Open an Apple .pages, .numbers or .key file on Windows — read the text, save the tables as Excel, keep the pictures.
Word Counter & Text Tools
Count words and characters, transform case, sort and dedupe lines, and generate placeholder text.
Invoice Generator
Make a professional PDF invoice with your logo, tax and payment details - no watermark, no account, no limit on invoices.
Images, video & visualsView all
Audio Trimmer
Cut a clip out of an audio file by dragging the handles on its waveform, with optional fades, and save it as a 16-bit WAV.
Video Compressor
Shrink a video to fit Discord, WhatsApp or email, convert to MP4 or WebM, extract MP3 audio or make a GIF - no watermark.
Video Cutter
Trim a video, cut parts out, join clips, remove the sound or fix the rotation without re-encoding, so nothing loses quality.
Video Repair
Fix an MP4 or MOV that stopped recording before it finished and won't play, using a working clip from the same camera.
Screen Recorder
Record your screen, a window or a tab with your microphone and a webcam bubble - no time limit, no watermark, no account.
HEIC to JPG
Turn a batch of iPhone photos into JPG or PNG that open anywhere, keeping the date they were taken.
Background Remover
Cut the background out of a photo at full resolution, touch up the edges, and save a transparent PNG — the photo is never uploaded.
Image Upscaler
Enlarge a small or blurry picture 2× or 4× with an AI model that adds detail - no credits, no sign-up, no upload.
Image Toolkit
Resize, crop, compress, and convert images — and strip EXIF metadata — entirely in your browser.
Font Viewer
Drop a .ttf, .otf or .woff to see its metrics, embedded licence and every glyph it contains.
Color Converter
Pick colors, build harmonious palettes, convert HEX/RGB/HSL, and check WCAG contrast.
GPX Viewer
Map a GPX, KML, KMZ, TCX, GeoJSON or shapefile track, see distance, ascent and duration, and export it as GeoJSON.
FIT Viewer
Open a .fit activity from a Garmin, Wahoo or Coros device: map, heart rate, power and laps, and convert it to GPX.
QR Code Generator & Scanner
Generate QR codes for links, Wi-Fi, and contacts — with colors and a logo — and scan codes from images.
Barcode Generator
Make EAN, UPC, Code 128 and ten more barcode formats, and export them as sharp SVG or PNG for labels.
SVG Optimizer
Strip the metadata and rounding cruft out of an exported SVG, with a before-and-after preview.
CorelDRAW Viewer
Open a .cdr file without CorelDRAW and save each page as SVG, PNG or PDF, all in your browser.
Diagram Toolkit
Write a flowchart, sequence or ER diagram as text and watch it draw itself — then export SVG or PNG.
3D Model Viewer
Open an STL, OBJ, PLY or GLTF, orbit around it, check the triangle count, and save a picture.
SketchUp Viewer
Open a SketchUp .skp model without SketchUp, switch its tags on and off, and save it as GLB, OBJ or STL.
DICOM Viewer
Look at the CT, MRI or X-ray scans from a hospital CD — scroll the slices and adjust the contrast, without uploading them.
DWG & DXF Viewer
Open a DWG or DXF drawing without AutoCAD — pan, zoom, switch layers on and off, measure, and save it as SVG or DXF.
Board Studio
A simple whiteboard for diagrams and planning — drop boxes, ellipses, and sticky notes, then connect them with arrows.
Data & formatsView all
Archive Toolkit
Build a ZIP, with a password if you like, or open a ZIP, RAR, 7z, TAR or ISO archive and pull files out — without installing anything.
CSV Toolkit
Open a big CSV without Excel mangling it — check it, convert to JSON, and chart a column.
Format Converter
Convert between JSON, YAML and XML in either direction, with a live preview and a one-click swap.
JSON Formatter
Format, minify, validate, and sort JSON — with key sorting and instant size feedback.
SQL Playground
Run real SQLite queries against a database file or a CSV — without uploading your data anywhere.
Excel Viewer
Open an .xlsx, .xls or .ods spreadsheet without Excel, read every sheet and formula, and save a sheet as CSV or JSON.
Access Database Viewer
Open an .mdb or .accdb without Microsoft Access - on a Mac too - browse its tables and save them as Excel, CSV or SQLite.
Parquet Viewer
Open a .parquet file: browse, sort and filter its rows, read its schema and statistics, and save it as CSV or JSON.
RDS & RData Viewer
Open R's .rds and .RData files without R: see each data frame as a table and save it as CSV, Excel or JSON.
Unit & Base Converter
Convert length, mass, temperature, data, and more — plus binary, octal, decimal, and hex.
ZIP to Text
Combine the text files in a ZIP into one text document, each headed with its name.
Code & developerView all
Code Formatter
Tidy JavaScript, TypeScript, CSS, HTML, JSON, YAML and Markdown with Prettier — without pasting code into someone else's server.
Cron Explainer
Turn a cron expression into plain English, break it into fields, and see the next five times it fires.
Diff Checker
Compare two blocks of text or JSON side by side, with highlighted additions and removals.
JWT Decoder
Read a token's header, claims and expiry — and check an HMAC signature — without it leaving the tab.
File Hash Checker
Work out a file's MD5, SHA-1, SHA-256 or SHA-512 checksum - even a multi-gigabyte download - and check it against the one you were given.
UUID & ID Generator
Generate UUID v4/v7, Nano IDs, and hex tokens in bulk — cryptographically random.
Learning & practiceView all
Elementary School Tools
Personal projects
Need a quick break?
Click anywhere in the area below to start the mini game.
Score 0Best 0
Press Space, Up Arrow, or tap to start.