Free No uploads — 100% browser-based

Reduce file size online free — images, PDFs & videos.

The only free tool that compresses Images, PDFs, and Videos in one place — all locally in your browser. Zero uploads. Zero limits. Zero cost.

Image PDF Video

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Absolute Privacy. Flawless Results.

Most online tools force you to upload your sensitive files to a remote server. We took a different approach. SwiftCompress uses advanced WebAssembly to optimize your files entirely inside your own browser.

Total Security

Your photos, confidential documents, and personal videos never touch our servers. Processing happens in your local RAM.

Instant Processing

No waiting for heavy files to upload or download. The compression begins the very second you select your file.

No Hidden Limits

Completely free to use. No sign-ups, no watermarks, and no artificial daily limits blocking your workflow.

Frequently Asked Questions

Yes. SwiftCompress processes all images entirely inside your browser using WebAssembly. Your files never leave your device — 100% private and secure.
We support JPG/JPEG, PNG, and WebP. PNG files are intelligently converted to WebP for maximum compression without visible quality loss.
At 80% quality, the difference is invisible to the human eye while reducing file size by 60–80%. Adjust the slider to find your ideal balance.
SwiftCompress handles images up to 20MB. There are no daily limits, no sign-ups, and no watermarks — always 100% free.
Typically 60–90% reduction depending on the image content and your quality setting. A 5MB photo can easily become under 500KB without visible degradation.

Reduce File Size Online Free — The Ultimate Guide for Images, PDFs & Videos (2026)

Whether you need to reduce image file size online free, shrink an oversized PDF, or compress a video for sharing — SwiftCompress is the only platform in 2026 that handles all three file types without ever uploading your data to a server. This ultimate guide covers everything you need to know about reducing file size for any format.

How to Reduce File Size: By File Type

Images (JPG, PNG, WebP)

Use the Image Optimizer. Set quality to 80% for web use, 60% for email, 50% for small targets like 100KB or 200KB. JPG images are re-encoded with intelligent quantization; PNG files convert to WebP for maximum reduction.

PDF Documents

Use the PDF Optimizer. The tool parses your PDF structure using pdf-lib, re-encodes embedded images, and strips invisible metadata. A 20MB scanned PDF typically compresses to under 2MB with text remaining sharp.

Videos (MP4, WebM, MOV)

Use the Video Reducer. Powered by FFmpeg compiled to WebAssembly, it re-encodes in H.264 at configurable CRF values. A 500MB 4K video reduces to under 100MB at 75% quality with no visible difference at 1080p.

Why SwiftCompress Is the Best Free File Size Reducer in 2026

Feature SwiftCompress Smallpdf iLoveIMG
Server uploads Never Always Always
Daily limits Unlimited 2 tasks/day 30/month
Price 100% Free $12/month $7/month

The Privacy Advantage: Zero Server Exposure

When you reduce file size online on most platforms, your files travel across the internet to a data center you don't control. SwiftCompress eliminates this risk entirely by using WebAssembly to run the compression engine inside your browser. Your data never leaves your device — guaranteed.