Which image formats can I upload?
Any common browser-supported format such as JPG, PNG, or WebP can be used as the source image.
Image Tools
Compress an Image with a Quality Slider
Make a JPG, PNG, or WebP image smaller using an adjustable quality slider that runs entirely in your browser. Built for websites, upload forms, email, and social posts where a lighter file loads faster.
How the compressor changes your image
Compress Image re-encodes your photo or graphic on an HTML canvas inside your browser tab, controlled by a single quality slider from 20% to 95%. You can upload a JPG, PNG, or WebP source file, but the output of this tool is always saved as a JPEG — that trade-off is what makes the compression effective, and it's also why the result behaves differently depending on what you started with.
Because output is always JPEG, any transparency in a source PNG is filled with a solid white background before compression runs. If you need to keep transparency, this is not the right tool — a format converter that keeps PNG output is a better fit. For ordinary photos, screenshots, and graphics without transparency, moving the slider down trades visible detail for a smaller file, and the preview updates immediately so you can judge the result before downloading.
Workflow at a glance
Use this quick flow to understand where the tool fits in your work and what to review before relying on the output.
Review checklist
Before
Check whether the image needs transparency (this tool always outputs JPEG) and note the current file size so you can measure the improvement.
After
Compare the new file size against the original, zoom into any text or fine detail, and preview on a phone-sized screen if the image is for mobile visitors.
When compressing actually helps
Use this tool when an image's content is fine but its file size is not — a page loading slowly because of a heavy hero image, a form rejecting an upload for being too large, or an email attachment that needs to shrink before sending. It solves a file-size problem, not a resolution problem; if the image's pixel dimensions are also too big for where it will be displayed, resize it first.
Who typically needs this
Bloggers and site owners
Shrink hero images and screenshots so pages load faster on slower mobile connections.
Online sellers
Compress product photos before uploading them to a marketplace or storefront with strict upload limits.
Students and job applicants
Reduce a scanned photo or ID picture that's too large for a form's upload cap.
Social media managers
Prepare lighter images for faster posting without opening a desktop editor.
What the quality slider controls
Quality slider from 20% to 95%
A single slider controls the JPEG re-encode quality, so you can trade visible detail for file size directly instead of guessing at a fixed preset.
Instant in-browser preview
The compressed result renders immediately so you can judge quality before downloading anything.
Accepts JPG, PNG, or WebP as input
Any common image format can be the source file, regardless of what the output ends up being.
Always exports as JPEG
The output is re-encoded as a .jpg file — transparent PNG areas are filled with white first, which matters if you need transparency kept.
No server upload
The resize and re-encode both happen on a canvas in your browser tab, so the original file never leaves your device.
Compressing an image step by step
- 1Open Compress Image and upload one photo or graphic.
- 2Drag the quality slider between 20% and 95% — lower values mean a smaller file and more visible compression.
- 3Click Process to re-encode the image on canvas in your browser.
- 4Review the preview and the resulting file size, then adjust the slider and reprocess if it isn't the balance you want.
Where a smaller image matters
A blogger compresses a hero image so a page loads faster on mobile without looking noticeably softer.
A shop owner shrinks product photos so a catalog page with a dozen images loads quickly.
A student compresses a scanned ID photo that a college portal's upload form was rejecting for size.
A social media manager compresses a campaign image before uploading it to keep posting quick on a mobile connection.
Where the compression happens
Compression happens on an HTML canvas in your browser — the image is decoded, re-encoded, and rendered locally, and nothing is uploaded to a server. The output is only available as a local download from your own browser tab.
Getting a good size-to-quality balance
- Start around 70-75% quality and only lower it further if the file size still isn't small enough.
- If the image is much larger than where it will actually display (for example, a 4000px photo shown at 800px), resize it first — compression alone won't fix an oversized image.
- For screenshots and graphics with flat colors or text, compare a couple of quality levels before settling, since JPEG artifacts show up fastest on hard edges.
- Keep the original file. If a compressed export looks wrong, you can always re-run the tool with a different quality setting.
Compression mistakes to avoid
Compressing a PNG that needs transparency
Output is always JPEG, so transparent areas get filled with white. Use a format converter instead if you need to keep transparency.
Compressing an already-compressed JPEG
Re-running compression on a previously compressed file stacks quality loss. Always compress from the original source, not from an earlier compressed copy.
Using a very low quality on text-heavy screenshots
Below roughly 50% quality, small UI text and thin lines often turn blurry or blocky.
Skipping a mobile preview
An image that looks fine on a large monitor can look softer on a small phone screen at the same compression level. Check both before publishing.
Before you publish the compressed image
Compress Image is most useful for shrinking a photo or graphic that already has the right content and dimensions but too large a file size. Because the output is always JPEG, it's the wrong tool the moment transparency matters — otherwise, a quality setting around 70-80% is a reasonable starting point for most web images.
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FAQ
Compress Image FAQ
Answers for using Compress Image on I Love Tool XYZ.
Does this tool keep PNG transparency?
No. Output is always exported as JPEG, so transparent areas are filled with white. Use a format converter tool if you need to keep transparency.
What quality setting should I start with?
70-75% is a reasonable starting point for photos; text-heavy graphics may need 80% or higher to stay sharp.
Can I compress more than one image at once?
Not on this page — it processes one image per run. Repeat the steps for additional images.
Does compressing upload my photo anywhere?
No. The resize and re-encode both happen locally on an HTML canvas in your browser tab.
Should I resize before compressing?
Yes, if the image's pixel dimensions are much larger than its display size — resizing first usually gives a bigger size improvement than compression alone.