Form / system upload size limits
Application forms and hiring systems often require images under 200KB, but original phone photos can be several MB. Use target size mode, enter the limit, and get it done in one pass without trial and error.
Processed locally, never uploaded
Free, unlimited use
Compress to a target size
Compress Images Fast — Shrink File Size or Hit a Target Size in One Click
Compression method
Quality 75%
Target size
KB or less
Side-by-side before/after view, drag the middle slider to compare details. Click the compare button in the file list to switch images
Upload your image, choose to compress by quality or set a target size (e.g. under 200KB), and get results in seconds — perfect for form upload limits or running out of photo storage. You can also drag to compare before and after directly.
90%max file size reduction
20MBmax size per image
0software to install
Never uploaded
Compression happens entirely in your browser — images never pass through any server
Target size mode
Set an upper file size limit directly, and it automatically matches the right quality — no manual trial and error
Batch compression
Select multiple images at once, apply one compression setting, and download them all as a package
Free, unlimited
No sign-up, no payment, no hidden usage limits
Common Use Cases
Three common compression needs, all handled by one tool
Whether it's an upload flow stuck on a form's size limit, or your photo library running out of storage, shrinking the file size is often the fastest fix.
Batch-shrinking ecommerce product photos
Launching dozens of product photos at once? Compressing them all significantly cuts storage usage in your store backend or cloud drive, while speeding up detail page loading without hurting conversion.
Chat apps & social media sharing
Messaging apps, blogs, and group chats have their own hidden size limits, and sharing an original image often gets re-compressed and turns blurry. Compress it yourself first, and you'll actually get more control over the final quality.
Supported Formats
Compress 4 common formats: JPG, PNG, WebP, GIF
Different formats have different compression headroom, with lossy formats showing the most obvious effect. Quality-based compression preserves the original format (GIF is treated as a static image and converted to PNG); target-size mode re-saves PNG/GIF as JPG to actually hit the target KB.
| Format | Compression Type | Size Reduction | Notes |
|---|---|---|---|
| JPG / JPEG | Lossy | Significant | Trades quality level for smaller size, with the most noticeable effect — best for photos |
| WebP | Lossy | Significant | Usually smaller than JPG at the same quality — great for web pages and store listings |
| PNG | Lossless / converted to JPG in target-size mode | Depends on original and mode | Re-compressed losslessly in quality mode; automatically converted to JPG in target-size mode to actually hit the target (transparent areas become white) |
| GIF | Treated as a static image | Depends on original and mode | Only the first frame is kept: saved as PNG in quality mode, JPG in target-size mode; animation is not preserved |
PNG re-compressed with more efficient encoding settings in quality mode — screenshots and UI mockups with large flat color areas usually shrink noticeably. If the original was already well-optimized, little to no size change is normal. When you need a firm upper limit, use “target size” mode.
How to Choose
How does this compare to built-in tools, professional software, and other online compressors
We don't need to convince you to use only this one tool, but these dimensions can help you decide which approach fits the image you're working on right now.
| Comparison | Image8K | Built-in OS Tools | Pro Software (PS/AI) | Other Compression Sites |
|---|---|---|---|---|
| Price | Free | Free | Paid subscription | Free / limited-use fees |
| Installation required | None — open in browser and go | Built-in, limited features | Requires install, steeper learning curve | None |
| Image uploaded to a server | Local processing, never uploaded | Local processing | Local processing | Mostly requires upload |
| Compress to a target size | Yes, auto-matches quality | Mostly not supported | Requires manual trial and error | A few support it |
| Batch compress multiple images | Yes, select multiple at once | Mostly not supported | Needs scripts or batch actions | A few support it |
| Before/after comparison | Yes, slider comparison | Not supported | Requires manually switching layers | Depends on the site |
How to Use
4 steps to compress an image
No software to install — everything happens right in the browser.
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1
Upload images
Click to select or drag your images into the page — select multiple at once. Supports JPG, PNG, WebP, and GIF, up to 20MB each.
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2
Choose a compression method
For quality-based compression, drag the slider to set the level; for a fixed upper size limit, switch to target size mode and enter the KB value, e.g. 200.
-
3
Start compressing
Click to start — the image is re-encoded locally in your browser, producing a result within seconds. Drag the slider to compare before and after.
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4
Download and save
Download individually or click download all to save every compressed image at once.
Technical Notes
Two things worth knowing about local compression
01
Re-encoded entirely in your browser
Compression happens directly on your device — the whole process never touches a server. It prioritizes professional compression engines (MozJPEG / WebP / Oxipng) for re-encoding, automatically falling back to the browser's built-in Canvas encoding when a network resource is unavailable. Both the original and compressed images only exist in your device's memory.
02
How target size mode automatically finds the right quality
After choosing “compress to target size,” the tool repeatedly tries different quality levels and re-encodes in your browser, gradually approaching your target size to find the sweet spot of “hitting the size limit while keeping quality as high as possible.” If lowering quality alone isn't enough, it will then gradually shrink pixel dimensions and try again. PNG/GIF are converted to JPG in this mode (the most common requirement for form uploads), making it easier to truly compress under the target KB.
FAQ
Common Questions About Image Compression
Is compression done on my computer or phone, or does it get uploaded to a server?
It's done entirely in your current device's browser, generating the compressed file directly — your original image is never uploaded to any server.
Will compressing make my image blurry or hurt quality?
JPG/WebP are lossy formats — the lower the quality slider, the smaller the file, but the more detail is lost. In the common 70%~90% quality range, the compressed result and the original are nearly indistinguishable to the naked eye. We recommend compressing once with the default quality, checking the before/after comparison slider, and raising the quality if you're not satisfied. PNG is a lossless format — quality itself won't degrade from compression, there's just no quality level to adjust, and how much the size shrinks depends on how optimized the original already was.
How does “compress to a target size” work, and why does it sometimes not hit the target?
Target size mode automatically tries different compression quality levels in your browser, and shrinks pixel dimensions if necessary, until the file size drops below your target. PNG/GIF are converted to JPG to actually hit the target KB. Only when the target is set extremely small (a few KB) or the image itself is very information-dense might it still not reach the target — most common form limits of 100–500KB are usually achievable.
Does a compressed GIF still keep its animation?
Current compression treats GIF as a static image (first frame only): quality-based compression produces a PNG, target-size mode produces a JPG — neither mode preserves animation. If you need to keep the animation, skip compression for now, or use a tool designed for frame-by-frame GIF editing.
What's the maximum number of images I can compress at once — is there a limit?
There's no fixed limit — you can select multiple images for batch compression at once. The actual number you can process is mainly limited by your device's memory and performance; we recommend keeping each image under 20MB.
Will the compressed image keep its EXIF capture data and PNG transparency?
Compression fundamentally re-encodes the image: PNG's transparency channel is preserved in quality mode; in target-size mode, PNG/GIF are converted to JPG and transparent areas are filled with white. The original's EXIF capture data and location metadata are not preserved after re-encoding — use the “EXIF Viewer/Remover” tool if you specifically need to view or remove that data.
Upload now and shrink your image size in seconds
No sign-up, no waiting — download as soon as it's done.