How is this different from Compress Image?
It isn't — both use the same quality-slider JPEG re-encode. This page just targets a different way of searching for the same task.
Image Tools
Reduce an Image's File Size
Shrink an image's file size using an adjustable quality slider, right in your browser.
How this reduces file size
This tool reduces an image's file size using the same underlying process as this site's Compress Image tool: a quality slider from 20% to 95% controls a JPEG re-encode on canvas, with a white background filled in first for any transparent areas. If you've already used Compress Image, this page solves the same problem — it exists as a separate entry point for anyone specifically searching for a way to 'reduce image size' rather than 'compress an image.'
Because the output is always JPEG, transparency from a source PNG is filled with white before the file is saved, the same trade-off that applies to Compress Image.
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.
After
Compare the new file size against the original and preview any text or fine detail before using the reduced file.
When to reach for a size reducer specifically
Use it whenever an image's file size — not its dimensions — is the actual blocker: an upload form rejecting a file for being too large, an email attachment limit, or a page that would load faster with lighter images.
Who needs a smaller image file
Anyone hitting an upload size limit
Shrink a photo or scan that a form keeps rejecting for being too large.
People emailing images
Reduce a photo's size before attaching it to an email with a size cap.
Website owners
Make images lighter so pages load faster on slower connections.
Anyone freeing up storage space
Shrink a batch of photos to save space without deleting them.
What the quality slider controls
Quality slider from 20% to 95%
Directly controls the JPEG re-encode quality, trading detail for file size.
Instant preview
See the reduced result before downloading.
Accepts JPG, PNG, or WebP input
Any common image format can be the source, regardless of the JPEG output.
Always outputs JPEG
Transparent PNG areas are filled with white before the file is saved as JPEG.
Reducing file size step by step
- 1Upload the image you want to shrink.
- 2Adjust the quality slider between 20% and 95%.
- 3Click Process to re-encode the image on canvas.
- 4Review the new file size and download the result.
Where a smaller file matters
Shrinking a photo or scan that an upload form keeps rejecting for being too large.
Reducing an image's size before attaching it to an email with a size cap.
Making website images lighter so pages load faster.
Shrinking a batch of photos to save storage space.
Where the reduction happens
The re-encode happens entirely on an HTML canvas in your browser — the image is never uploaded to a server.
Getting a good size-to-quality balance
- Start around 70-75% quality and only lower it further if the file is still too large.
- If the image's pixel dimensions are much bigger than needed, resize it first for a bigger size reduction than quality alone.
- Remember the output is always JPEG — a transparent PNG will get a white background.
- Keep the original until you've confirmed the reduced file still looks acceptable for its intended use.
Size reduction mistakes to avoid
Expecting transparency to survive
Output is always JPEG with a white background fill, so transparent PNG areas won't stay transparent.
Reducing quality too aggressively on text-heavy images
Very low quality settings can make small text or fine lines look blurry or blocky.
Not resizing an oversized image first
If the pixel dimensions are much larger than needed, resizing first often reduces size more than the quality slider alone.
Skipping the file-size check
Compare the new size against the original to confirm the reduction actually solved the problem you started with.
Before you upload the smaller file
Image Size Reducer solves the same file-size problem as Compress Image, using the same quality-slider re-encode. Use whichever name matches how you think about the task — the result will be the same.
Need hands-on help?
Get help with documents, SEO, content, or website fixes
Use this tool for quick work. If you need a real file prepared, a page reviewed, or a website issue fixed, send the URL and describe the problem.
FAQ
Image Size Reducer FAQ
Answers for using Image Size Reducer on I Love Tool XYZ.
Does this keep PNG transparency?
No. Output is always JPEG, so transparent areas are filled with white.
What quality setting should I start with?
70-75% is a reasonable starting point for most photos.
Is my image uploaded anywhere?
No. The re-encode happens entirely on canvas in your browser.