Receipt — session summaryissued · local
Private file tools.
Your files never leave.
64tools for PDFs, video, images and audio run inside this browser tab using WebAssembly and WebCodecs. No file upload, cloud-processing copy or account. Free to use—and the local file boundary is verifiable in your browser's Network panel.
Most online file tools begin by copying your document to somebody else's server. AntiUpload removes that transfer entirely: the file, its name and its contents stay on your device from input to download. Conversion runs in a Web Worker on your CPU using WebAssembly. No account or cloud retention is required. Advertising and aggregate analytics remain outside the file-processing boundary. Close the tab and the working file data is gone.
- ✓Local execution.File bytes go from your picker to your browser's memory and directly back to your download. Open DevTools → Network and verify it.
- ✓No content telemetry. File names, document text, media frames, passwords and output buffers are never transmitted.
- ✓No server copy. There is no staging bucket, temporary upload, processing queue or cloud-retention window.
- ✓Ads never receive your file. Advertising and aggregate site analytics are separate from the local conversion engine. Privacy is not a paid tier.
Useful starting points
01.Compress PDFShrink file size while keeping quality.→02.Merge PDFCombine any number of files into one.→03.Split PDFPull pages or ranges into new files.→04.Extract PagesPick pages visually, download as one PDF.→05.Organize PDFReorder, rotate, copy, remove, and insert blank pages in one view.→+ 26 more pdf tools→
01.Compress VideoTarget a size cap or pick a quality preset.→02.Video ConverterMP4 · MOV · WebM · MKV · AVI, any direction.→03.Batch Video ConverterConvert 2–12 videos sequentially into one ZIP.→04.Video TrimmerCut start, end, or multiple ranges. No re-encode when possible.→05.Add Text to VideoAdd timed, wrapped text in seven safe-area positions.→+ 15 more video tools→
01.Compress ImageJPG and PNG, quality slider.→02.Resize ImagePixel, percent, or preset dimensions.→03.Convert ImageJPG · PNG · WebP · AVIF · HEIC, any direction.→04.Image to Text (OCR)Pull text out of any image with OCR.→05.HEIC to JPGConvert iPhone HEIC photos to JPG — decoded in your browser, never uploaded→+ 4 more image tools→
01.Audio TrimmerCut start, end, multi-range. Stream-copies — instant.→02.Audio JoinerConcatenate audio files into one track.→03.Change Audio VolumeGain or precise two-pass LUFS normalization.→04.Audio ConverterConvert audio with five destination presets, CBR/VBR, channel remixing, and a transparent duration/size/encoding plan→
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Common questions
asked first, answered straight5 questionsQ.01Where do my files actually go?
Nowhere. Tools run inside a Web Worker on your device. No upload, no staging server, no temporary cache. The fastest way to verify: open DevTools → Network, then run a tool. The only requests you'll see are the page itself, the WASM module, and CSS. After that, zero.
Q.02Why is this free? What's the catch?
The work runs on your device, so there is no conversion-server bill to pass back to you. When advertising is enabled, we use a small number of clearly labeled placements beside substantive content—not popups, processing screens, or download buttons. There is no premium tier and the tools work with an ad blocker.
Q.03Are the conversions actually any good?
Strong on text-heavy documents — résumés, reports, articles, books. Weaker on complex magazine layouts, math equations, and scanned PDFs in non-Latin scripts. Video and image tools are tested against the sample files we publish; some operations are slower because they're CPU-bound on your machine. Read exactly how we test and what we do not claim on the methodology page.
Q.04Does this work on a phone?
Yes. Drag-and-drop, file pickers, HEIC handling — all work on iOS and Android. Heavy operations (large compress, OCR, video re-encoding) take longer on phones because they're CPU-bound, but they finish. Background tabs may pause processing.
Q.05Can I run AntiUpload offline?
After your first visit, the static assets are cached. Most tools work fully offline. Auto Subtitles (which downloads a ~75 MB Whisper model on first use) is the exception — it labels that fetch clearly before downloading.