Compress any photograph to under 400KB with near-original quality. High encoder settings for excellent visual results.
Last updated: August 2026
400KB
Exact Target
JPEG, WebP
Output
Near-Lossless
Quality
Private
No Uploads
Drop image here to compress to 400KB
JPEG, PNG, WebP, AVIF, HEIC. All processing stays in your browser.
Want to compare against a different limit? Change the target field above, no need to drop the file in again.
Five steps is all it takes. Everything runs in your browser so there is no waiting for an upload or server processing.
Set your target
The target is pre-set to 400KB. Adjust it to any value if your platform has a different limit.
Drop your image
Drag and drop a JPEG, PNG, WebP, AVIF, HEIC or HEIF file onto the tool. No upload happens, the file stays on your device.
Quality check, usually resolved fast
Quality 100 is tried first, and at 400KB it often already fits. Runs in a background worker either way, so the tab stays responsive.
Fine-tune without starting over
Change the target or switch between JPEG and WebP afterward and the tool recompresses automatically.
Download the result
Preview and size stats appear. Download the compressed file immediately.
400KB sits in the range for high-quality web content where visual fidelity takes priority over minimal file size.
E-commerce listings
Product images on Jumia, Konga and similar marketplaces perform best between 300KB and 500KB. 400KB gives you excellent quality without hitting upload limits.
Editorial content
High-quality blog posts and online magazine articles use 400KB images for in-content photographs where detail and clarity matter more than raw page speed.
Social media posts
When sharing images to LinkedIn articles, Facebook posts or Twitter media, uploading a 400KB source ensures the platform's compression keeps quality high in the preview.
Portfolio and showcase sites
Photographers and designers uploading work samples to portfolio platforms typically compress to 400KB to 500KB to balance quality against page load time.
Choosing JPEG for a transparent product cutout
If the source PNG has a transparent background, JPEG will fill it with a solid color. The tool warns about this and offers a one-click switch to WebP, which keeps transparency.
Expecting visible quality loss at 400KB
For most phone and DSLR photos there isn't any at this target. 400KB is generous enough that the fast-path quality-100 check frequently succeeds outright.
Assuming the tool will pad a file up to 400KB
It won't. Compression only ever reduces size. If your image is already under 400KB, the tool detects that and offers the original for download rather than processing it further.
Not choosing WebP when the platform supports it
WebP consistently beats JPEG at the same file size for product and web photography. If the destination platform accepts it, it's worth the switch.
Re-dropping the file just to compare a different target
That's no longer necessary. Changing the target size field after a result already appears recompresses automatically using the same cached image.
Uploading HEIC straight to a platform that doesn't accept it
Most marketplaces and CMS platforms reject HEIC silently. Dropping it into this tool first converts and compresses in one pass, outputting a standard JPEG or WebP.
400KB is a practical limit for product photography on e-commerce platforms, featured images on high-quality blogs and images shared in professional social media posts. At this size, images retain near-original quality at typical display sizes and load quickly on broadband connections. Some online marketplaces cap seller product images between 350KB and 500KB.
At 400KB, compression artefacts are virtually invisible. The search has enough size budget to use high quality settings for all but the largest or most detailed source files, preserving fine texture detail such as fabric weave, product labels and fine print. For most phone photos, the compressed output will be identical in appearance to the original at normal viewing sizes.
It checks quality 100 first. Because 400KB is a generous budget, a full quality 100 encode often already fits under it for a typical phone photo, in which case that's what you get with no further searching needed. If quality 100 overshoots, the tool binary searches downward to find the highest quality that still fits under 400KB.
Yes, WebP will produce a noticeably sharper image than JPEG at the same file size, and it's the only output option here that preserves transparency. At a 400KB budget, WebP can use a higher quality setting than JPEG because of its more efficient compression. If the platform you are uploading to supports WebP, choose it for better results.
Yes. The tool accepts images of any resolution. A high-resolution product photo taken with a DSLR or a recent phone camera can be compressed to 400KB without resizing the pixel dimensions in almost all cases. If the source file is unusually detailed, the search finds the highest quality setting that still produces a file under 400KB, only in rare cases does it also reduce dimensions.
JPEG, PNG, WebP, AVIF, HEIC and HEIF are all accepted as input. Output is JPEG or WebP only, never PNG, regardless of what you upload.
Yes. The tool keeps the decoded image cached, so adjusting the target size field or clicking JPEG or WebP after a result already appears triggers an automatic recompress rather than asking you to drop the file in again.
No. The quality check and any search that follows both run in a background Web Worker rather than on the page's main thread, so the tab stays responsive even while a large source photo compresses.
JPEG has no alpha channel, so a transparent PNG compressed with JPEG selected has its transparent areas filled with a solid color instead. If the tool detects transparency and JPEG is selected, it shows a warning with a one-click button to switch to WebP, which keeps transparency intact.
No. The image is decoded to raw pixels and re-encoded during compression, so EXIF metadata, including GPS location and camera details, does not carry over to the compressed file.
No. Decoding uses the Canvas API, or a dedicated decoder for HEIC and HEIF files, and the compression itself runs via WebAssembly in a background Web Worker. All of this happens entirely in your browser. Your image never leaves your device, you can verify this by disconnecting from the internet after the page loads, the tool still works.
No, this tool handles one image at a time. For a batch of product photos, run each one through individually.
No sign-up. No uploads. Drop your image above and download the compressed version in seconds.
