Check the real requirement
Find the form or website's maximum file size, accepted format and required pixel dimensions. A limit of 1 MB is different from a request for 1200 × 1200 pixels, and some forms require both.
- Use exact published dimensions when they are provided.
- Use JPG for ordinary photos unless transparency is required.
- Keep PNG or WebP when transparency or sharp graphic edges matter.
Resize before heavy compression
If a phone photo is 4000 pixels wide but will be shown at 1200 pixels, resize it first with Keep aspect ratio enabled. Then compress the resized copy. This often creates a smaller and cleaner result than compressing the full-size original.
- Avoid enlarging a small image because it adds file size without adding real detail.
- Start JPG quality around 75 to 85 for normal photos.
- Inspect faces, text and high-contrast edges after compression.
Meet a strict upload limit
Use Compress to Target Size when the final file must stay below a specific KB value. Enter 1024 KB for 1 MiB or use the exact number stated by the form. If quality reduction alone cannot reach the target, reduce the pixel dimensions and try again.
- Transparent areas become white in a JPG result.
- Keep the original photo until the new file is accepted.
- Check the downloaded file—not just the preview—before submitting it.
Try the related Docsy tools
Open the tool that matches your task, review its limitations and keep your original files until you have checked the result.