Compress Image to 300KB
Reduce any photo to under 300 KB in a few seconds, keeping it sharp. The 300 KB target is already set, so just add your image.
Compress to 300KB · Step 1 of 3 · Add your photo
Drop a photo to compress it under 300 KB
or paste with Ctrl+V · JPG PNG WebP HEIC GIF · max 25 MB
Processed on this device. Nothing is uploaded.
Example
Before and after
We ran this sample through the compress to 300kb tool above. The numbers under each image are measured from the real files.
How to
How to compress Image to 300KB
- 1.
Add your photo. Drop it, paste it or take one with your camera.
- 2.
Keep the 300 KB target. The size is already set to 300 KB. Change it only if your form asks for a different limit.
- 3.
Download. Download the file and attach it wherever you need it.
Why this size
When a 300 KB limit makes sense
300 KB is a comfortable limit for email, marketplaces and websites. Photos keep almost all of their detail while taking a fraction of the original space.
The tool keeps your full resolution whenever it can and only reduces quality as far as it has to.
| Upload | Typical limit |
|---|---|
| Email photo | 300-500 KB |
| Product photo | 200-500 KB |
| Website banner | 300-500 KB |
| Portfolio image | under 1 MB |
Use cases
When you need a 300 KB photo
Email attachments
High-quality photos that still fit a strict mailbox limit.
Marketplace listings
Product photos that keep their detail for buyers.
Portfolios
Work samples that look good and upload without errors.
Website hero images
Large banners that stay under your performance budget.
Insurance claims
Clear photos of damage that portals accept the first time.
School projects
Photo-heavy assignments that fit the submission limit.
Tips
Tips that make a difference
- 1.
Crop first. Cropping to just the face or document removes pixels you do not need, so the quality can stay higher.
- 2.
Use JPG. JPG gets much smaller than PNG for photos. Use PNG only if the form asks for it.
- 3.
Check the dimensions too. Some portals also require a size such as 3.5 x 4.5 cm or 200 x 230 px. Set both to avoid a second rejection: resize in cm or in pixels first, then compress.
- 4.
Plain backgrounds compress better. A plain wall behind you leaves more of the 300 KB for your face.
FAQ
Compress to 300KB: questions
- How do I compress an image to 300KB?
- Add your photo above and download the result. The 300 KB target is already set: the tool lowers the JPG quality step by step, and the pixel size only if it must, until the file is just under 300 KB.
- How do I reduce photo size to 300 KB on my phone?
- Open this page in Chrome or Safari, tap to pick a photo or take a new one, then download. It works on Android and iPhone with nothing to install.
- Does it change the width and height?
- Only if it has to. The tool first lowers the quality at full size, and shrinks the image only when 300 KB is still out of reach.
- Will my photo look blurry?
- No. At 300 KB most photos look the same as the original on screen.
- Can I make it exactly 300 KB?
- The result lands just under the limit, usually within a few percent of 300 KB, so the form never rejects it for being too big.
- How do I convert an image to JPG under 300KB?
- Add a PNG, HEIC, WebP or JPG photo. The result is always a JPG just under 300 KB, so converting and compressing happen in one step.
- My form wants a PDF under 300 KB, not a JPG. What do I do?
- Use JPG to PDF under 300 KB: it turns one photo or several pages into one PDF under 300 KB. A PDF upload field rejects a JPG even when the size is right.
- Is my photo uploaded?
- No. Compression runs in your browser on your own device. The photo never reaches our servers.
- Can I compress many photos at once?
- Yes. Drop several photos and each one is compressed to the same target. Download them one by one or together as a ZIP. For a large batch, the bulk image compressor is made for it.
Checked
How we checked this page
Checked by the SizePort team on .
We test the tool with sample photos before it goes live and check that the sizes on this page match what it produces. Rules and platforms change, so if something here is out of date, tell us and we will correct it.
How the tool works
The compressor first lowers the JPG quality at full resolution, testing several settings until the file is just under the target. Only if quality alone cannot get there does it reduce the width and height, a little at a time. The result is a JPG. Everything happens in your browser; your images are never uploaded.