Compress Images Online
Reduce image file size by up to 80% — free, private, and instant. Supports JPG, PNG, and WebP.
What Is an Image Compressor?
An image compressor reduces the file size of photos and graphics by applying optimized encoding — discarding visual data that the human eye can't perceive (for JPG/WebP) or removing unnecessary metadata (for PNG). A typical smartphone photo is 3–8 MB; compressed to quality 75%, it becomes 500 KB–1.5 MB with virtually no visible difference. TweakFiles compresses images entirely in your browser using the Canvas API — your photos are never uploaded to any server.
Why Compress Images?
Image file size affects everything from website performance to storage costs. Specific scenarios where compression is essential:
- Website speed — images account for 50–70% of total page weight. Compressing images is the single most effective way to improve Core Web Vitals and Google rankings.
- Email attachments — Gmail, Outlook, and Yahoo limit attachments to 25 MB.
- Cloud storage — iPhone photos at 12 MP average 3–5 MB each. A year of photos (2,000 images) uses 6–10 GB. Compressed, that same collection fits in 1.5–3 GB.
- E-commerce listings — Amazon, Shopify, and eBay have image size recommendations.
- Social media — platforms re-compress your uploads anyway. Pre-compressing gives you control over the final quality.
Compression Quality Guide
The quality slider controls the trade-off between file size and visual fidelity. Here's what to expect at each level:
- 90–100% — Visually identical to original. 10–30% file size reduction. Use for professional photography and print.
- 75–90% — Imperceptible difference for most viewers. 40–60% reduction. The sweet spot for most use cases.
- 50–75% — Slight softening visible on close inspection. 60–80% reduction. Good for web thumbnails and email.
- Below 50% — Visible artifacts. 80%+ reduction. Use only when smallest possible file size is critical.
How TweakFiles Compression Works
TweakFiles uses the browser's native Canvas API and image encoding engine. For JPG images, it re-encodes at the specified quality level. For PNG, it processes through the canvas to strip metadata and optimize encoding. For WebP, it uses Google's WebP encoder built into modern browsers. The entire process happens in your browser using your device's hardware — no server processing means no upload wait, no privacy risk, and no file size limit beyond your device's memory.
How to Compress Images in 3 Steps
Upload Your Images
Drag and drop your JPG, PNG, or WebP images into the compressor. You can select multiple files for batch compression.
Adjust Quality
Use the quality slider to balance file size vs. visual quality. 75% is recommended for most use cases.
Download
Download compressed images individually or all at once. The originals are never modified.
TweakFiles vs Other Image Compressors
| Feature | TweakFiles | TinyPNG | Compressor.io |
|---|---|---|---|
| Price | Free forever | Free (20/day limit) | Free (limited) |
| Privacy | 100% client-side | Server upload | Server upload |
| Batch | Unlimited | 20 files max | 1 file at a time |
| Quality Control | Adjustable slider | Auto only | 4 presets |
| Signup | No | No (API: yes) | No |