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.

Can't open a file? Find the tool by its type

Built by John McMillan, a senior full-stack engineer who is open to remote roles. See what I can do for your team.

Popular

Recently added

Documents & text

Merge, split, edit, annotate, redact, compress and password-protect PDFs — nothing leaves your browser.

Remove the password from a PDF you can open, or take off restrictions on printing, copying and editing, without uploading it.

Compress PDF to a Size

Get a PDF under 100 KB, 500 KB, 1 MB or any size a form asks for, with the gentlest compression that fits.

Bates Numbering

Stamp running Bates numbers on every page of one or many PDFs, with a legend and a production log.

Turn a PDF's layers on and off and save just the ones you want, like one size of a sewing pattern.

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.

Signature to Transparent PNG

Photograph your signature on paper and get a clean PNG with a transparent background, shadows removed.

Click a line in a PDF and change the words - a typo, a name, a date - in the PDF's own font where it can be, with find and replace. Nothing is uploaded.

Create Fillable PDF

Turn a PDF into a form people can fill in: blanks found automatically, every kind of field, tab order, and existing fields edited.

Put photos and scans - JPG, PNG, HEIC and more - into one PDF, a page each, with JPEGs kept exactly as they are.

Save the pages of a PDF as JPG or PNG pictures at the resolution you need, one page or all of them.

Turn the tables in a PDF into Excel or CSV, with columns you can adjust on the page and numbers that add up.

Turn a PDF into an editable Word document with its fonts, paragraphs, columns, tables and pictures kept.

Bank Statement Converter

Convert PDF bank statements to Excel, CSV, OFX or QIF, with every running balance checked and no page limit.

Convert DjVu books to PDF with their searchable text, bookmarks and links kept, after reading and searching them on the page.

Convert XPS and OXPS documents to sharp vector PDFs with their own fonts and searchable text, after checking them on the page.

Fattura elettronica

Open Italian e-invoices (.xml and signed .xml.p7m), check the digital signature, and save the invoice as PDF with its attachments. In Italian.

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 (.docx, .xlsx or .pptx) that will not open, and get back everything that can be saved, without uploading it.

Unprotect Excel

Remove sheet and workbook protection from Excel files, and Restrict Editing from Word and PowerPoint, even when the password is forgotten.

See what changed between two versions of a PDF - every word added or removed, and every page that looks different.

Open an ebook from Gutenberg or any DRM-free source and read it here, with a contents list and adjustable text size.

Open a .docx file, make quick edits with a basic toolbar, then download as .doc, HTML or text — all in your browser. An old .doc gives only a rough text scrape.

Turn a Word .docx into a PDF that keeps its pages, fonts, tables and pictures, with the text still searchable.

Turn a workbook into a PDF as Excel prints it: print areas, page setup, fit to page, repeating titles and formatting.

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.

Read an Evernote export without Evernote and save the notes as Markdown for Obsidian, or as HTML.

Markdown Editor

Write Markdown with a live HTML preview, then copy or export to HTML or PDF.

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.

Transcribe a recording or a video's sound with Whisper, in the browser — then save it as text, or as SRT or VTT subtitles.

Natural American and British voices read any English text aloud, made by an AI model in your browser - save it as MP3, with no limit.

Add Subtitles to Video

Captions from what is said in a video, edited and styled - word by word as on TikTok, or classic subtitles - and burned in with no watermark, all in the browser.

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.

Open an Outlook .pst or .ost mailbox without Outlook - read every email, search by subject, senders and recipients, save attachments, export to .eml or .mbox.

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.

Open Visio .vsd and .vsdx diagrams without Visio, search their text, and save them as PDF, PNG or SVG. Stencils and templates too.

Open Microsoft Works .wps, .wks, .xlr and .wdb files, and old Lotus and Quattro Pro sheets, and save them as Word or Excel.

Open a Microsoft Project .mpp file without Project: the task list, Gantt chart and resources, saved as Excel, CSV, XML or PDF.

Open .one sections and whole notebooks without OneNote, print them, or save them as HTML or Markdown.

Open Windows .chm help files on a Mac, Linux or Chromebook: contents, index and search, and save as PDF or Markdown.

Open old WinHelp .hlp files that Windows 10 and 11 cannot: links, popups, pictures 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.

Garbled Text Fixer

Turn mojibake like “Ã©” and “â€™” back into the right letters, and convert text files in old encodings to UTF-8.

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 & audio

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.

Pitch & Tempo Changer

Change a song's key or a recording's speed, one without the other, with voices kept natural and an A-B loop to practise.

Join MP3s and recordings into one file, every track made equally loud, with gaps or crossfades and a chapter list.

Remove Background Noise

Take hiss, hum, fans and room noise out of voice recordings and videos with an AI model that runs on your computer.

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.

Trim a video, cut parts out, join clips, remove the sound or fix the rotation without re-encoding, so nothing loses quality.

Fix an MP4 or MOV that stopped recording before it finished and won't play, using a working clip from the same camera.

Video Background Remover

Cut the person out of a video and put them on a colour, green screen, blur or picture - or a transparent background.

Video Stabilizer

Smooth out shaky phone, action-camera and drone videos, or hold the camera still, and compare before you save.

Turn CCTV recordings (Dahua .dav, Hikvision, raw .264) into MP4s that play anywhere, without re-encoding.

Convert Olympus and Philips DSS dictation recordings to MP3 or WAV for a typist or transcription service.

Split a one-file FLAC, APE or WavPack album into tagged tracks using its .cue sheet, losslessly or as MP3.

Screen Recorder

Record your screen, a window or a tab with your microphone and a webcam bubble - no time limit, no watermark, no account.

Lottie & TGS Viewer

Play a Lottie animation or Telegram sticker frame by frame and save it as GIF, MP4, WebM or PNG.

Play old Flash games and animations without Flash Player, save the pictures and sounds inside, and record them as video.

Compress Image to KB

Make a photo or scan fit an upload form's limit - under 20, 50 or 100 KB, at exact pixels and dpi if needed.

Turn a batch of iPhone photos into JPG or PNG that open anywhere, keeping the date they were taken.

Snapchat Memories Fixer

Put captions back on exported Snapchat Memories, join split videos, and fix every photo's date and location.

Convert game textures from DDS to PNG, JPG or TGA, or back to DDS as DXT1, DXT5 or BC7 with mipmaps, in batches.

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.

Remove Objects from Photos

Brush over people, objects or blemishes and they disappear, filled in by an AI model on your computer, at full resolution.

Find the faces in photos and videos and blur, pixelate or black them out - leave anyone visible with a click.

Colorize Photos

Black and white photos in colour, at full resolution, by an AI model on your computer - with a before/after slider, no watermark and no upload.

Restore Old Photos

Remove scratches, cracks, creases and dust from old photos: found for you, checked by you, filled to match.

Enlarge a small or blurry picture 2× or 4× with an AI model that adds detail - no credits, no sign-up, no upload.

Resize, crop, compress, and convert images — and strip EXIF metadata — entirely in your browser.

Watermark Photos

Add your name or logo to hundreds of photos at once, in a corner or tiled, the same look on every size.

Drop a .ttf, .otf, .woff or .woff2 to see its metrics, embedded licence and every glyph it contains.

Convert fonts between TTF, OTF, WOFF and WOFF2, including OTF to TTF with real TrueType outlines.

Color Converter

Pick colors, build harmonious palettes, convert HEX/RGB/HSL, and check WCAG contrast.

Map a GPX, KML, KMZ, TCX, GeoJSON or shapefile track, see distance, ascent and duration, and export it as GeoJSON.

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.

Trace PNG and JPG images into real SVG vectors: logos, icons and line art, in colour or black and white, with the background removed.

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.

EMF & WMF Viewer

Open Windows .emf and .wmf clip art and drawings, and save them as SVG, PNG or PDF - several at once, nothing uploaded.

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 a GLB, FBX, OBJ, STL, 3MF or DAE model, orbit around it, and convert it to GLB, STL, OBJ or USDZ.

SketchUp Viewer

Open a SketchUp .skp model without SketchUp, switch its tags on and off, and save it as GLB, OBJ or STL.

STEP & IGES Viewer

Open a .step, .stp or .iges CAD model without CAD software, hide or isolate parts, and save it as STL, OBJ or GLB.

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.

A simple whiteboard for diagrams and planning — drop boxes, ellipses, and sticky notes, then connect them with arrows.

Data & formats

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.

Open a CSV or log file of any size, even several gigabytes, without Excel mangling it - filter 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.

Format, minify, validate, and sort JSON — with key sorting and instant size feedback.

Run real SQLite queries against a database file or a CSV — without uploading your data anywhere.

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.

Open a .parquet file: browse, sort and filter its rows, read its schema and statistics, and save it as CSV or JSON Lines.

SPSS & SAS Viewer

Open .sav, .sas7bdat, .xpt and .dta files without SPSS, SAS or Stata, with value labels, statistics and frequencies.

MAT, HDF5 & NetCDF Viewer

Open MATLAB .mat, HDF5 and NetCDF files: browse variables, see slices as tables, charts and heat maps, save CSV.

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.

Prism File Viewer

Open a GraphPad Prism .pzfx project without Prism: see every data table and save it as CSV.

Unit & Base Converter

Convert length, mass, temperature, data, and more — plus binary, octal, decimal, and hex.

Combine the text files in a ZIP into one text document, each headed with its name.

Code & developer

Tidy JavaScript, TypeScript, CSS, HTML, JSON, YAML and Markdown with Prettier — without pasting code into someone else's server.

Turn a cron expression into plain English, break it into fields, and see the next five times it fires.

Compare two blocks of text or JSON side by side, with highlighted additions and removals.

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 & practice

Equation Editor

Click symbols, find one by name, start from a library of common formulas or type LaTeX, then paste the equation into Word, Google Docs or a web page.

Typing Speed Test

Timed typing practice with live WPM, accuracy, and a per-key error heatmap.

Elementary School Tools

Practice basic arithmetic with timed, configurable drills.

A simple traffic light simulation.

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.