Free Image Compressor for JPG, PNG & WebP
Compress image files online without changing your workflow. Slim Files helps reduce file size for websites, email, content publishing, and sharing while keeping output quality practical and predictable.
Use this when the image already looks fine but the file is too heavy for the destination.
- Best for product photos, screenshots, blog assets, and email attachments that need a lighter export.
- Start around quality 80 to 85 for JPG or WebP before pushing lower.
- If the image is much larger than the final display size, resize first and compress second.
Compression works best when you match the file to the destination rather than forcing every image toward the smallest possible number.
Drop files or click to upload
Max file size: 50MB. Supports image files.
Workflow safeguards
Validated inputs
Files are checked by content before processing begins.
Metadata stripping
EXIF and producer fields are removed from processed outputs by default.
Temporary retention
Files are purged from disk within 1 hour.
Upgrade for API access and larger workflows
Paid plans are better for recurring teams, larger file batches, and authenticated API processing. The free workflow above stays centered on the web tool first.
Compare PlansWhat this image compressor is best for
This image compressor is built for the jobs people actually do every day: preparing product shots for ecommerce, shrinking CMS uploads, cleaning up screenshots before sending them in email, and reducing download weight for content-heavy pages. Instead of relying on browser-reported file types, Slim Files validates every upload by content and then applies plan-aware limits before processing begins.
For website teams, the biggest benefit is usually speed. Smaller images mean less bandwidth, faster page rendering, and fewer oversized assets slipping into a publishing workflow. For operations and support teams, the win is consistency: one place to compress JPG, PNG, and WebP files without asking contributors to install extra desktop software first.
The goal is not to create aggressively degraded images just to chase the smallest number possible. The goal is to make it easier to land on a practical quality setting, download clean results quickly, and move on. If you need exact dimensions after compression, pair this tool with the Image Resizer. If you need a different output format, move to the File Converter next.
How to use Image Compressor
Upload your image files (JPG, PNG, or WebP).
Adjust the compression quality slider to your preference.
Click the "Process" button to start optimization.
Download your optimized files individually or as a ZIP archive.
Best Use Cases
- Speeding up website load times
- Saving storage space on mobile devices
- Reducing email attachment sizes
- Preparing high-res photos for social media
Compression Tips & Starting Settings
- "For web use, 70-80% quality is usually indistinguishable from 100%."
- "PNG files are best compressed if they contain solid colors or text."
- "WebP often provides the best compression-to-quality ratio for modern browsers."
Supported Formats
All transformation engines are optimized for high-fidelity output.
Frequently Asked Questions
Is my data safe?
Yes. All files are processed on demand and automatically deleted from our servers after 60 minutes. We do not use your data for training or tracking.
What is the maximum file size?
Signed-out and free users can upload files up to 50MB each. Pro supports 500MB per file, and Business supports up to 5GB per file.
Related guides for this workflow
The tool handles the processing, but these guides explain the choices around it: format decisions, upload-limit tradeoffs, ecommerce prep, and when resizing or compression is the better first move.
JPG vs PNG vs WebP: which image format should you actually use?
If you only have a few seconds, use JPG for photos, PNG for screenshots and transparency, and WebP for modern web delivery when you want smaller files at the same visual quality. This version goes deeper on practical defaults, real file-size ranges, and copy-paste settings you can use without guessing.
How to resize product images for Shopify without making them look cheap
Shopify product images need more than just smaller file size. They need consistent dimensions, practical compression, and enough clarity to support product confidence without slowing the store down.
How to compress images for email without making them look blurry
Email is one of the easiest places for image workflows to go wrong. Files are often larger than they need to be, but over-compressing them can make the result look cheap or hard to read. This guide explains the tradeoff in a practical way.
When should you resize an image instead of compressing it?
A lot of people reach for compression when the real issue is oversized dimensions. This guide turns that into a clearer decision sequence so you can tell whether to resize, compress, or combine both without damaging the image.
How to compress a screenshot before sending it in Slack or Teams
A screenshot of a full 4K monitor can easily be 3 to 6 MB. Send a few dozen of those in a busy Slack channel during a single product review and you have noticeably slowed down the channel for everyone — slower scroll, slower image loads, more storage burn on your team plan, and a more cluttered search experience when somebody tries to find an old conversation later. Compressing screenshots before sending is a small habit that pays off for the whole team.
How to prepare images for a Wix or Squarespace website
Both Wix and Squarespace handle image optimization automatically once a file is uploaded — but only as well as the source allows. Upload a 12 MB phone photo and the platform will compress and resize it for browser delivery, but it still has to ingest, store, and process that 12 MB file in the first place. Sites with hundreds of poorly-prepared images end up slower, more expensive to host, and harder to manage than they need to be.
How to compress an image to 500 KB without ruining it
When someone says they need an image under 500 KB, the real question is not which magic button to press. It is whether the source image, dimensions, and format make that target realistic. This guide explains how to get close to 500 KB without destroying the file in the process.
How to resize an image for Shopify
Shopify image prep is not just about making files smaller. It is about choosing consistent dimensions, preserving product clarity, and giving the storefront files that load fast without looking cheap. This guide focuses specifically on the resize part of that workflow.