Convert files in your browser -
nothing is uploaded, ever.

Every tool runs entirely in-browser. No server. No account. Fully private and works offline once loaded.

No Upload 100% Private Works Offline Free
Browse All Tools How it works ↓

Tools by category

Image Converters

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HEIC to JPG
Convert iPhone photos to JPG
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WebP to JPG
Convert WebP for wider compatibility
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PNG to JPG
Reduce file size, keep quality
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Image Compressor
Shrink any image without quality loss
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PDF Tools

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PDF to JPG
Convert PDF pages to images
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PDF Compressor
Reduce PDF size without uploading
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Merge PDF
Combine multiple PDFs into one
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JPG to PDF
Turn JPG images into a PDF
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Video Tools

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MKV to MP4
Convert downloaded videos to MP4
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Video Trimmer
Cut and trim video clips
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Video to GIF
Convert video clips to animated GIF
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MP4 to MP3
Extract audio from video files
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Dev Tools

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JSON Formatter
Beautify and validate JSON
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CSV to JSON
Convert CSV data to JSON
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Base64 Encoder
Encode text or data to Base64
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UUID Generator
Generate random UUID v4 identifiers
→

Why OfflineConverter?

Your files never leave your device.

Every tool on this site runs using browser APIs - WebAssembly, Canvas, FileReader. When you select a file, it is read into memory in your tab and processed locally. The result is streamed back to you as a download. No byte of your data is ever sent to our servers or any third party.

  • No cloud storage - files are never stored anywhere
  • No account required - open a tool and go
  • No file size limits imposed by upload quotas
  • GDPR compliant - no data processing on our end

How it works

1

Select a file

Pick any file from your device. Nothing leaves your computer.

2

Browser processes it

The tool runs locally in your browser using JavaScript - no server involved.

3

Download the result

Your converted file downloads instantly. Nothing is sent to any server.

Browse by category

Offline Image Converter
HEIC, AVIF, WebP, PNG, JPG and more
Secure PDF Converter
Merge, split, rotate, compress - all offline
Offline Video Converter
Compress, convert, extract audio locally
Browser Dev Tools
JSON, CSV, Base64, UUID and more

Frequently asked questions

Does anything actually get uploaded?

No. Every tool processes files entirely in your browser. No data is ever transmitted to any server.

Can I use these tools without an internet connection?

Yes - once the page has loaded, most tools work fully offline using JavaScript in your browser tab.

Is there a file size limit?

There is no server-imposed limit. The practical limit is your device's available RAM. Files up to a few hundred MB work well in most modern browsers.

Which file formats are supported?

We support JPG, PNG, WebP, AVIF, HEIC, SVG, BMP, GIF, PDF, MP4, MOV, MKV, AVI, MP3, JSON, CSV, YAML, Base64, and more - 81 tools in total.