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Free tools that never upload your data

49 PDF, developer, text, and everyday tools — running entirely in your browser. No server, no sign-up, no one but you ever sees your files.

Popular:Merge PDFImage Resize & ConvertJSON FormatterJWT DecoderSign PDFCompress PDF
  • Files never leave your device
  • No cloud, no server
  • No account, no ads
  • Works offline

100% client-side · open-source engines · verifiable in DevTools

Download on theMac App Store

Now on macOS — free, native, and sandboxed with no network access. What's different?

PDF tools

16 tools

Organize

Merge PDFCombine multiple PDFs into one file, in your chosen order.Split PDFExtract pages or page ranges into separate PDF files.Rotate & ReorderRotate, reorder, and delete pages with a visual page grid.

Edit & annotate

Sign PDFDraw, upload, or paste your signature and place it on any page.Watermark PDFStamp CONFIDENTIAL, DRAFT, or any text across every page.Add Page NumbersNumber pages in the position and style you want.Edit MetadataView, edit, or completely strip PDF metadata.

Convert & extract

PDF to ImagesRender pages as PNG or JPEG at the resolution you pick.Images to PDFCombine JPG, PNG, and iPhone HEIC photos into one PDF.Extract TextCopy or download all text in the document.OCR (Scanned PDFs)Recognize text in scans — on your device, unlike most OCR tools.

Passwords & privacy

Unlock PDFRemove a password you know — it never leaves your browser.Protect PDFAdd password protection with 128-bit encryption.

Optimize & fix

Compress PDFShrink PDF file size without sending it anywhere.Grayscale PDFConvert colors to print-friendly black and white.Repair PDFRebuild a corrupted file from everything that can be salvaged.

Developer tools

25 tools

Format & validate

JSON FormatterPretty-print, minify, and validate JSON with exact error positions.Regex TesterLive match highlighting and capture groups (JavaScript flavor).Cron ParserPlain-English explanations and the next five run times.Markdown PreviewLive GitHub-style rendering, sanitized on your device.SQL FormatterPretty-print queries in five dialects.HTML/CSS/JS FormatterBeautify or minify — with the real Terser for JS.WCAG Contrast CheckerAA/AAA verdicts with a live text preview.

Encode & decode

JWT DecoderDecode and verify tokens — they never leave your browser.Base64 Encode/DecodeText and files, standard or URL-safe, fully UTF-8 aware.URL Encoder/DecoderPercent-encode query values or decode messy URLs.HTML EntitiesEscape markup or decode entities back to readable text.Number Base ConverterBinary, octal, decimal, hex — exact BigInt conversion.JSON ↔ YAML ↔ TOMLConvert configs between formats, live and locally..env ↔ JSONEnvironment files to JSON and back — secrets stay local.curl → fetch/axiosPaste a curl command, get ready-to-use JavaScript.

Generators

Hash GeneratorMD5 and SHA hashes of text or files via WebCrypto.UUID / ULID / Nano IDUUID v4/v7, ULID, and Nano ID in bulk from crypto randomness.QR Code Generator & ReaderGenerate PNG/SVG codes or decode one from an image.Password GeneratorCrypto-random passwords with an honest entropy meter.Lorem IpsumPlaceholder words, sentences, and paragraphs.Mock Data GeneratorFake names, emails, and JSON records for testing.

Text & time

Timestamp ConverterUnix epoch to human time and back, with live current time.Case ConvertercamelCase, snake_case, kebab-case, and friends — all at once.Diff CheckerCompare two texts line-by-line or word-by-word.Color ConverterHEX, RGB, HSL, and OKLCH with a live swatch.

Text & data

4 tools
Word CounterWords, characters, sentences, and reading time — live.Text Sorter & DedupeSort, dedupe, trim, shuffle, and reverse lines.CSV ↔ JSONSpreadsheet exports to JSON and back, with a preview table.Slug GeneratorURL-friendly slugs, diacritics handled.

Everyday tools

4 tools
Unit ConverterLength, weight, temperature, data sizes, and more.Percentage CalculatorX% of Y, what percent, and percent change.Image Resize & ConvertLive before/after preview — AVIF, WebP, JPG, PNG via WASM codecs.Stopwatch & PomodoroStopwatch with laps, countdown, and Pomodoro focus.

Why KeepItLocally?

Almost every "free online tool" starts the same way: upload your file. We start the opposite way — by never asking for it.

Traditional online tools

  • Upload your files to their server
  • Wait while it processes remotely
  • Trust their retention & deletion policy
  • Hit free file-size and page limits
  • Sign-ups, ads, and upsells

KeepItLocally

  • Runs entirely in your browser
  • Instant — no server round-trip
  • Files never leave your device
  • No artificial file-size limits
  • No account, no ads, no tracking of your files

New — now on the Mac App Store

KeepItLocally for Mac

47 of the tools you use here — PDF, image, and developer — as a native macOS app. It goes further than the website can: the app is sandboxed with no network access to your files, so it is physically incapable of uploading them.

Free to download, one file at a time. Requires macOS 14 or later. Batch processing unlocks with the optional Pro upgrade.

Download on theMac App Store

  • Batch processing

    Run one operation across a whole folder at once, via the optional Pro upgrade.

  • Finder Quick Actions

    Right-click a file in Finder to run a tool, without opening the app first.

  • Shortcuts automation

    Wire the tools into a Shortcut and let the same job run itself next time.

  • No file-size limits

    Large scans and long documents aren't bound by what a browser tab can hold.

Why files stay private here

No backend

This is a static site. There is no server that could receive, store, or log your documents.

Enforced by the browser

A strict Content-Security-Policy blocks the app from sending data to third parties — the browser enforces it, not our goodwill.

Verifiable

Open DevTools → Network while you work: zero requests with your data. It even works with the internet disconnected.

Frequently asked questions

Are my files uploaded to a server?

No. KeepItLocally has no backend at all — it is a static site. Every operation (PDFs, images, JSON, tokens) runs inside your browser using WebAssembly and JavaScript. Your data never leaves your device.

How can I verify that nothing is uploaded?

Open your browser's DevTools, switch to the Network tab, and process a file. You'll see no requests carrying your data. Our Content-Security-Policy additionally blocks the site from talking to third-party servers.

Is KeepItLocally free?

Yes — every tool on this website is completely free, with no sign-up, no accounts, and no paid tier. The separate Mac app is also free to download; its optional one-time $9.99 Pro upgrade adds batch processing across a whole folder, and it is what funds the site.

Does it work offline?

Once a tool page has loaded, processing works even if you disconnect from the internet — because nothing is ever sent anywhere.

Is there a Mac app?

Yes — KeepItLocally: PDF & Images is on the Mac App Store, free to download and requiring macOS 14 or later. It brings 47 of the PDF, image, and developer tools to macOS natively, and adds Finder Quick Actions, Shortcuts automation, and no file-size limits. It is sandboxed without network access to your files, so it cannot upload them even in principle. Batch processing is part of the optional Pro upgrade.