100% client-side — files never leave your device

Free online file converters

Edit PDFs and convert 3D, CAD, image, audio, video and data files — entirely in your browser. No upload, no signup: your files never leave your device.

Drop any file here3D models, images, PDFs, audio, video or data — we'll open the right tool

STEP · STL · glTF · PNG · JPG · WebP · PDF · MP3 · M4A · MP4 · MOV · CSV · JSON …

3D & CAD converter

STEP, IGES, BREP, STL, OBJ, glTF, 3MF and more — powered by a real CAD kernel in your browser.

STEP · STL · OBJ · glTF · 3MF

Image converter

Convert PNG, JPG, WebP, BMP, GIF, SVG and AVIF with quality control and resizing — in bulk.

PNG · JPG · WebP · SVG · AVIF

PDF tools

Edit, sign, highlight, merge, split and convert PDFs — private and watermark-free.

Edit · Sign · Merge · Split

Audio converter

M4A, AAC, OGG, Opus, FLAC and more to MP3 or WAV, with bitrate control.

M4A · MP3 · WAV · FLAC

Video tools

A real video encoder in your browser: video to GIF, compression, WebM and audio extraction.

GIF · Compress · WebM · MP3

Data converter

CSV ⇄ JSON ⇄ TSV ⇄ YAML with headers, type detection and pretty-printing.

CSV · JSON · YAML · XML

3D viewer

Inspect CAD and mesh files with an assembly tree, section views and measurements.

View STEP · STL · GLB

Utilities

QR codes, favicons, ZIP archives, hashes, Base64, UUIDs, word count and text diff.

QR · Favicon · ZIP · Hash

Popular 3D & CAD conversions

STEP to STLSTEP to OBJSTEP to glTFSTEP to GLBIGES to STLIGES to OBJSTL to OBJOBJ to STLSTL to 3MFFBX to GLBCOLLADA to GLBPLY to STL

Popular PDF & audio tasks

Edit PDFMerge PDFSplit PDFJPG to PDFPDF to JPGM4A to MP3WAV to MP3MP3 to WAVOGG to MP3FLAC to MP3Opus to MP3

Popular image conversions

Batch image resizerBulk image compressorFavicon generatorQR code generatorPNG to WebPJPG to WebPWebP to PNGWebP to JPGPNG to JPGJPG to PNGSVG to PNGAVIF to JPGCSV to JSONJSON to CSVJSON formatter and validatorCSV cleaner

Browse all supported 3D file formats, open the free 3D viewer, or read conversion guides on the blog.

How it works

  1. Drop your file onto the page. Use the drop area above or open any tool directly. The file is read from your disk into the browser tab — it is not uploaded, so there is no waiting for a transfer.
  2. Choose what you want done. Pick an output format, or the edit you need: compress, resize, redact, merge, recognise text, simplify a mesh. Settings that cost quality are labelled with what they cost.
  3. Download the result. Processing runs on your own CPU and the finished file is handed straight to your browser’s download — unwatermarked, with no account and no expiring link.

Why filetools.co

  1. Private by architecture. Conversion runs on your machine via WebAssembly — there is no server to upload to. Safe for NDA'd CAD data and personal photos alike.
  2. Real engineering tools. The 3D converter runs a full CAD geometry kernel in your browser, reading the exact surfaces in a STEP file rather than approximating them with a mesh.
  3. Free without a catch. No accounts, no limits, no watermarks — client-side tools cost nothing to run per file.

Frequently asked questions

Are my files uploaded to a server?

No. Every tool on filetools.co runs entirely in your browser using WebAssembly and native browser APIs. Files never leave your device — verifiable in your browser’s network tab.

Is it really free?

Yes — no accounts, no file limits, no watermarks. Processing happens on your own machine, so there are no server costs to pass on.

What can I convert?

You can edit PDFs and work with 3D and CAD formats, images, audio, video and data files. Popular formats include STEP, STL, OBJ, PNG, JPG, WebP, MP3, MP4, CSV and JSON.

Does it work offline?

Once a tool page has loaded, conversion works without an internet connection — nothing is sent anywhere. It is also the easiest way to prove to yourself that no upload is happening.

Is there a file size limit?

There is no limit imposed by us, because there is no server to impose one. The real ceiling is your device’s memory: everyday documents, images and models are comfortable, while a two-hour 4K video or a multi-million-triangle scan can exhaust a browser tab.

Do I need to install anything or create an account?

Neither. Every tool is a web page — open it and drop a file in. There is no account, no signup form, no extension and no watermark on the output.