Compress image file size to a target KB
Use this image compressor by size to choose a custom KB target, reduce image size in KB, and review each result before downloading.
Target-size workflow
How to compress image file size to a target KB
Enter the required KB limit, add images, and review whether each compressed result hits the target.
Enter the required file size
Type the KB value requested by your form, CMS, email tool, or upload portal before adding images.
Add JPEG, PNG, or WebP images
Select files from your device and keep image compression in the browser without creating an account.
Review size and download
Check output size, target status, quality attempts, and dimensions before saving the compressed image files.
Set any custom KB target
Choose a custom file-size target such as 100 KB, 200 KB, 500 KB, 1 MB, 2 MB, or the exact upload limit you need.
Reduce image size in KB
CompressWise searches for a practical smaller file while keeping the public workflow local in your browser by default.
Know whether the compressed image hit the target
Every result shows hit target, already under target, or closest result so you can decide whether the output is acceptable.
Image compressor by size
Why use an image compressor by size
Use this page when the real task is a custom file-size limit instead of a general quality adjustment.
Compress image file size without guesswork
This page is for people who need to compress image file size to a specific KB limit, not just move a vague quality slider.
Use custom upload limits
Use it when a form, CMS, email tool, or portal asks for a size that does not match the fixed 50KB, 100KB, 200KB, or 500KB pages.
Try quality search before resizing
The workflow tries codec quality settings first and uses resize fallback only when the target is too small for quality alone.
Understand hard target-size limits
Some images cannot reach a small target without visible quality loss or smaller dimensions, so closest results are labeled clearly.
Target-size formats
Choose the right format for target-size compression
JPEG, PNG, and WebP files respond differently when you compress toward a specific KB value.
Compress JPEG photos to a target size
JPEG usually responds well to quality search and is often the easiest format to compress toward a smaller file size.
Compress PNG screenshots and transparency to a target size
PNG file size depends on colors, transparency, and flat graphics, so aggressive KB targets may need stronger tradeoffs.
Compress WebP assets to a target size
WebP files are often compact already, but a custom file-size target can still help with CMS and performance limits.
Target-size settings that match the job
Start with the exact upload limit, then review the status so you know whether the browser hit the target or found the closest result.
Target
Start with a realistic KB limit
Choose the file-size limit that matches the real task. Very small targets may require quality reduction or smaller dimensions.
Status
Check hit target or closest result
A hit means the output is at or below the target. Closest result means the tool could not safely reach that file size.
Originals
Keep your source image
File-size compression can change quality, dimensions, or metadata, so keep the original image for important work.
Common target-size use cases
Best uses for reducing image size in KB
Use the custom file-size compressor for portals, CMS limits, email attachments, and nonstandard KB targets.
Custom upload limits
Prepare images for portals or online forms that ask for a specific maximum file size in KB.
Image size reducer for exam uploads
Prepare smaller image files for exam, registration, or school upload rules that specify a KB limit.
Reduce image file size for email
Make large images easier to attach or share by targeting a practical KB or MB size.
Image size reducer for email signature
Make a signature image smaller when an email client or template needs a lighter file.
Images with pixel or dimension limits
Use target-size compression when the search task mentions KB, pixels, width, height, or dimensions.
Signature image size reducer
Reduce signature image file size while keeping the original file for important document workflows.
Private by default
Compress image file size without uploading by default
The public target-size workflow is designed to process selected images locally in your browser.
Local target-size processing
Selecting a file should not send the image to our server. The public target-size tool is designed around browser-local processing.
No account required
You can compress image file size without creating an account, adding billing details, or saving a cloud history.
Result details stay visible
Each result shows the target, output size, status, and whether resize fallback was used.
Current release boundaries
Image file size limits to know before you start
Exact byte-level output cannot be guaranteed for every image, so the result table labels hit target and closest result states.
- This page accepts JPEG, PNG, and WebP images.
- Targets can be set from 10 KB to 5000 KB.
- A local batch can contain up to 10 images to keep memory usage predictable.
- Each image must be 20 MB or smaller in the current public interface.
- Image file size is not the same as width and height; this page targets KB, not dimensions.
- Exact byte-level output cannot be guaranteed for every image and format.
- Very aggressive targets may require visible quality reduction or resized dimensions.
Questions, answered
Image file size compressor FAQ
How do I reduce image size in KB?
Enter the KB limit you need, add a JPEG, PNG, or WebP image, and review whether the compressed result hit the target or only reached the closest safe result.
Can I compress image to target size?
Yes. This page is built to compress image to target size when you know the maximum KB or MB value required by a form, CMS, or portal.
Is this an image size reducer?
Yes, but it is an image size reducer for file size in KB or MB, not a width and height editor for changing pixel dimensions only.
Can I compress image to required size or custom size?
Yes. Use the target field to compress image to required size, and use the same workflow when you need to compress image custom size for a nonstandard upload rule.
Can I reduce image to specific size or resize image to KB?
Yes. In search terms, reduce image to specific size and resize image to KB usually mean lowering file size, so this page targets the selected KB value.
Is image file size the same as image dimensions?
No. File size is measured in KB or MB, while dimensions are width and height in pixels. This page focuses on reducing file size in KB.
Can this tool compress an image to an exact file size?
It compresses toward the selected target and reports whether the result is at or below that target. Exact byte-level output cannot be guaranteed for every image.
What happens if the image cannot reach my target KB?
The result is marked as closest result. You can choose a larger target, accept stronger tradeoffs, or start from a smaller source image.
Does the tool resize images?
It searches quality settings first. Resize fallback is used only when the selected target is too small for quality changes alone.
Which formats are supported?
The target-size workflow supports JPEG, PNG, and WebP images in the current public release.
Are my images uploaded?
No. The public workflow is designed to process selected images locally in your browser by default.
Should I use this page or a fixed 50KB or 100KB page?
Use this page for custom KB limits. Use the fixed 50KB, 100KB, 200KB, or 500KB pages when that exact target matches the upload rule.
Ready to try it?
Return to the image file size compressor
Enter a target KB value and compress images in your browser.