Is LocalSquash really free to use?

Yes, LocalSquash is 100% free with no hidden costs, subscriptions, or premium tiers. There are no watermarks and no registration required. We believe privacy-focused tools should be accessible to everyone.

How does browser-based compression and conversion work?

LocalSquash uses FFmpeg compiled to WebAssembly (WASM), which runs directly in your web browser. When you select a file, it's processed entirely on your device using your computer's resources. Your files are never uploaded to any server, making it completely private and secure. This applies to both compression and format conversion.

What file types can I compress and convert with LocalSquash?

LocalSquash supports almost all media formats for both compression and conversion. Video: MP4, MOV, WebM, AVI, MKV, WMV, FLV, and more (converts to MP4). Images: JPEG, PNG, WebP, HEIC, TIFF, BMP, GIF, RAW formats, and more (converts to WebP, JPEG, or PNG). Audio: MP3, WAV, FLAC, AAC, OGG, Opus, M4A, AIFF, and more (converts to MP3, AAC, or Opus).

How much can I reduce my file size?

File size reduction varies by file type and settings, but typical results are 50-95% smaller files. Videos often achieve 70-90% reduction, images 50-80%, and audio 60-90%. The compression is adjustable so you can balance quality vs. file size.

Is there a file size limit?

There are no artificial limits. The only constraint is your device's available memory (RAM). For most modern devices, files up to 2GB work well. Larger files may be slower or require more RAM.

Can I use LocalSquash offline?

Yes! After the initial page load, LocalSquash works completely offline. The FFmpeg WebAssembly module is cached in your browser, allowing you to compress files without an internet connection.

Why should I use LocalSquash instead of other compressors?

Unlike cloud-based compressors that upload your files to servers, LocalSquash processes everything locally. This means: 1) Complete privacy—your files never leave your device, 2) No waiting for uploads/downloads, 3) No server-imposed file size caps, 4) Works offline, 5) Faster processing for large files.

Is LocalSquash safe and secure?

Absolutely. Since all processing happens in your browser, your files never touch our servers. There's no data collection, no tracking of your files, and no risk of data breaches. Your sensitive documents, personal photos, and private videos stay completely private.

100% Client-Side — Files never leave your device

Compress & Convert
Video, Image & Audio

Reduce file sizes by up to 95% entirely in your browser — no upload, free, private, works offline.

Compress Video Compress Image Compress Audio

No Upload RequiredNo WatermarksNo Sign-upWorks Offline

Video Compressor

Compress & convert MP4, MOV, WebM, AVI and more. Trim, crop, resize.

MP4MOVWebMAVI

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Image Compressor

Compress & convert JPG, PNG, WebP, HEIC and more. Crop, resize, strip metadata.

JPGPNGWebPHEIC

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Audio Compressor

Compress & convert MP3, WAV, FLAC, AAC and more. Trim and adjust settings.

MP3WAVFLACAAC

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TL;DR

LocalSquash is a free, open web app that compresses and converts video (MP4, MOV, MKV, WebM), image (JPEG, PNG, WebP, HEIC), and audio (MP3, WAV, FLAC, AAC) files locally in your browser using FFmpeg WebAssembly. No files are uploaded. Typical file size reduction is 50–95%. Works offline after the initial page load. No account, no watermark, no file size cap.

Why Use LocalSquash for File Compression?

LocalSquash is the only compression tool that processes files 100% locally in your browser. No uploads, no servers, no file size limits, and no sign-up.

100% Private

Files never leave your device. All processing happens locally in your browser.

Lightning Fast

Instant browser-based compression powered by FFmpeg WebAssembly. No upload delays.

100% Free

No fees, subscriptions, or watermarks. Unlimited uses with no sign-up required.

Large File Support

Handle files up to 2 GB. No server-imposed caps—limited only by your device’s available memory.

How to Compress Files With LocalSquash

Compress any file in three steps—no sign-up, no upload, no account needed.

Choose Tool

Select video, image, or audio compressor from the navigation.

Configure

Drop your file locally, then adjust quality and format settings.

Compress

One click — your compressed file downloads automatically.

Supported Formats

Media Type	Supported Input Formats	Output Format	Typical Reduction
Video	MP4, MOV, WebM, AVI, MKV, WMV, FLV	MP4 (H.264)	70–95%
Image	JPEG, PNG, WebP, HEIC, TIFF, BMP, GIF	WebP, JPEG, or PNG	50–90%
Audio	MP3, WAV, FLAC, AAC, OGG, Opus, M4A	AAC, MP3, or Opus	60–90%

What Can You Compress With LocalSquash?

Used by over 10,000 creators, developers, and teams to compress media for email, messaging, social media, and web publishing.

Compress Video for Email

Reduce video to under 25MB for Gmail, Outlook attachments.

Compress Video for Discord

Get videos under Discord’s 8MB or 50MB limit. Share clips easily.

Compress Video for WhatsApp

Reduce video size for WhatsApp’s 16MB limit without quality loss.

Optimize Images for Web

Compress images for faster loading. Improve Core Web Vitals and SEO.

Compress Photos for Social Media

Optimize photos for Instagram, Facebook. Maintain quality, reduce size.

Compress Podcast Audio

Reduce podcast file sizes. Perfect bitrate for voice recordings.

Frequently Asked Questions About LocalSquash

Quick answers about privacy, file limits, supported formats, and how browser-based compression works.

: Yes, LocalSquash is 100% free with no hidden costs, subscriptions, or premium tiers. There are no watermarks and no registration required. We believe privacy-focused tools should be accessible to everyone.
: LocalSquash uses FFmpeg compiled to WebAssembly (WASM), which runs directly in your web browser. When you select a file, it's processed entirely on your device using your computer's resources. Your files are never uploaded to any server, making it completely private and secure. This applies to both compression and format conversion.
: LocalSquash supports almost all media formats for both compression and conversion. Video: MP4, MOV, WebM, AVI, MKV, WMV, FLV, and more (converts to MP4). Images: JPEG, PNG, WebP, HEIC, TIFF, BMP, GIF, RAW formats, and more (converts to WebP, JPEG, or PNG). Audio: MP3, WAV, FLAC, AAC, OGG, Opus, M4A, AIFF, and more (converts to MP3, AAC, or Opus).
: File size reduction varies by file type and settings, but typical results are 50-95% smaller files. Videos often achieve 70-90% reduction, images 50-80%, and audio 60-90%. The compression is adjustable so you can balance quality vs. file size.
: There are no artificial limits. The only constraint is your device's available memory (RAM). For most modern devices, files up to 2GB work well. Larger files may be slower or require more RAM.
: Yes! After the initial page load, LocalSquash works completely offline. The FFmpeg WebAssembly module is cached in your browser, allowing you to compress files without an internet connection.
: Unlike cloud-based compressors that upload your files to servers, LocalSquash processes everything locally. This means: 1) Complete privacy—your files never leave your device, 2) No waiting for uploads/downloads, 3) No server-imposed file size caps, 4) Works offline, 5) Faster processing for large files.
: Absolutely. Since all processing happens in your browser, your files never touch our servers. There's no data collection, no tracking of your files, and no risk of data breaches. Your sensitive documents, personal photos, and private videos stay completely private.

How Does Browser-Based Compression Work?

LocalSquash uses FFmpeg.wasm, a WebAssembly port of the industry-standard FFmpeg multimedia framework, to perform professional-grade compression directly in your browser with zero server-side processing. According to the FFmpeg project, FFmpeg processes over 80% of all transcoded video on the internet.

Video compression uses H.264/AVC encoding with configurable CRF (Constant Rate Factor). CRF 18–23 gives near-lossless quality; CRF 28–35 maximizes compression. Output is always MP4 for universal compatibility.

Image compression supports WebP (30–50% better compression than JPEG), JPEG, and PNG with quality adjustable from 1–100%.

Audio compression offers AAC, MP3, and Opus with bitrates from 32kbps to 320kbps.

FFmpeg WebAssembly: The industry-standard FFmpeg multimedia framework compiled to WebAssembly, enabling professional-grade encoding to run entirely inside a web browser with zero server-side processing.
CRF (Constant Rate Factor): A quality-based encoding parameter for H.264 video. Values range 0–51: CRF 18–22 is near-lossless, CRF 23–26 balances quality and size, CRF 28–35 maximizes compression.
WebP: A modern image format by Google offering 30–50% better compression than JPEG at equivalent visual quality. Supported by all modern browsers.
AAC (Advanced Audio Coding): The successor to MP3, producing better audio quality at the same bitrate. Native codec for iOS, macOS, YouTube, and most streaming platforms.

Compress & ConvertVideo, Image & Audio

Video Compressor

Image Compressor

Audio Compressor

Why Use LocalSquash for File Compression?

100% Private

Lightning Fast

100% Free

Large File Support

How to Compress Files With LocalSquash

Choose Tool

Configure

Compress

Supported Formats

What Can You Compress With LocalSquash?

📧Compress Video for Email

💬Compress Video for Discord

📱Compress Video for WhatsApp

🌐Optimize Images for Web

📸Compress Photos for Social Media

🎵Compress Podcast Audio

Frequently Asked Questions About LocalSquash

How Does Browser-Based Compression Work?

Compress & Convert
Video, Image & Audio

Compress Video for Email

Compress Video for Discord

Compress Video for WhatsApp

Optimize Images for Web

Compress Photos for Social Media

Compress Podcast Audio