Adjust image brightness, contrast and sharpness

In this guide

How it works

Open a still image and start from the neutral value of 1 for each setting.
Change the required values between 0 and 3 and choose the output format and dimensions.
Inspect the result for readable details, lost highlights and harsh outlines.

Input, result and limits

Property	Details
Input	JPG / PNG / WebP / HEIC
Output	JPG / PNG / WebP
Important limitation	Conventional image correction; no AI reconstruction of missing details.

The workflow in six views

Adjust image brightness, contrast and sharpness — Input: Open a still image and start from the neutral value of 1 for each setting. — 1Input
Open a still image and start from the neutral value of 1 for each setting.

Adjust image brightness, contrast and sharpness — Settings: Change the required values between 0 and 3 and choose the output format and dimensions. — 2Settings
Change the required values between 0 and 3 and choose the output format and dimensions.

Adjust image brightness, contrast and sharpness — Apply: JPG / PNG / WebP / HEIC → JPG / PNG / WebP — 3Apply
JPG / PNG / WebP / HEIC → JPG / PNG / WebP

Adjust image brightness, contrast and sharpness — Before and after: Original file → Edited copy — 4Before and after
Original file → Edited copy

Adjust image brightness, contrast and sharpness — Review: Check small text at normal viewing size Check background, transparency and colours Keep the original for comparison — 5Review
Check small text at normal viewing size Check background, transparency and colours Keep the original for comparison

Adjust image brightness, contrast and sharpness — Save: Inspect the result for readable details, lost highlights and harsh outlines. — 6Save
Inspect the result for readable details, lost highlights and harsh outlines.

Example

Before

Original file

After

Edited copy

Check these details in the result

Check small text at normal viewing size
Check background, transparency and colours
Keep the original for comparison

Useful next steps

Scan documents from photos into a multipage PDF	Choose up to 20 document images, adjust corners and perspective, arrange the pages and create a PDF. Review color or grayscale filters before exporting.
Convert a still image to JPG, PNG or WebP	Convert one still image to JPG, PNG or WebP. Set quality and maximum edge length, then review transparency and colours in the result.
Reduce image size with quality and dimension settings	Adjust a still image's format, quality and maximum edge length for a smaller file. Compare size and detail rather than expecting a fixed percentage reduction.
Convert JPG and PNG images to PDF	Bring JPG and PNG images together in a PDF. Check the image order and review the generated pages before downloading.

Small adjustments are easier to evaluate

For a dark document photo, try slightly increasing brightness first. Then check whether extra contrast improves the words or makes faint lines disappear. Additional sharpening can emphasise edges but also produce visible halos. Large changes to several settings at once make it harder to identify which adjustment actually helped the result.

Work with the information already in the image

The tool uses conventional image corrections. It does not reconstruct unreadable letters, restore missing focus or generate new details with AI. A fresh photograph is often more useful for a badly blurred receipt. For further document work, combine the corrected image into a PDF or use the scanner to adjust its perspective. Check important numbers against the source rather than trusting a sharper-looking edge.