Sharpen Image Online – Free, No Watermark

How to sharpen an image

Three steps, no uploads.

1

Add your photos

Drag and drop, or click to browse. Up to 50 images per batch.

2

Pick a strength

Light, Medium, or Strong. Medium is enough for most photos that look slightly soft.

3

Download

Save images one by one, or grab the whole batch as a ZIP.

What sharpening actually does

It raises contrast along edges, which makes a soft photo look crisper. It does not reconstruct detail that was never captured.

Private by design

Every operation runs inside your browser. Your images are never uploaded anywhere.

Free & unlimited

No accounts, no daily caps, no watermarks stamped on your files. Ever.

Unsharp masking

The classic darkroom technique: each pixel is compared against a blurred copy, and the difference is added back at the strength you pick.

Works everywhere

Any modern browser on Windows, macOS, Linux, iOS, and Android.

Where sharpening helps

Product photos resized for a shop, old scans that lost their bite, screenshots with fuzzy text, and slides meant for large screens.

Product photos

Old scans

Screenshots

Presentation slides

Social posts

Printed documents

Sharpen images in any modern browser

AmiIMG runs fully in your browser on every modern platform.

Windows

Chrome, Edge, Firefox

macOS

Safari, Chrome

Linux

Any modern browser

iOS

Safari on iPhone, iPad

Android

Chrome, Samsung Internet

Sharpening FAQ

Can sharpening fix an out-of-focus photo?

No. It adds contrast along edges that already exist; detail the lens never captured can't be brought back. Very blurry shots gain little.

When is Strong the right choice?

For images that will be shown small or printed at reduced size — the halos visible at full zoom mostly disappear when scaled down. For viewing at 100%, stay with Light or Medium.

Does the output format change?

JPG, PNG, and WebP keep their format; GIF and BMP are exported as PNG.

Are my images uploaded to a server?

No. Sharpening runs entirely in your browser — your images never leave your device.

Is there a limit?

Up to 50 images per batch, each up to 30 MB.

Related tools

More free image tools from AmiIMG.

Image Studio

All tools in one workspace — edit, then export.

Resize Image

By pixels, percent, or longest edge — proportions kept.

Resize to 1920×1080

Exact 1920×1080 canvas, centered and never stretched — batch up to 50, in your browser.

Resize to 1080×1080

Exact 1080×1080 canvas, centered and never stretched — batch up to 50, in your browser.

Resize to 1080×1920

Exact 1080×1920 canvas, centered and never stretched — batch up to 50, in your browser.

Resize to 1080×1350

Exact 1080×1350 canvas, centered and never stretched — batch up to 50, in your browser.

Resize to 500×500

Exact 500×500 canvas, centered and never stretched — batch up to 50, in your browser.

Resize to 800×800

Exact 800×800 canvas, centered and never stretched — batch up to 50, in your browser.

Resize to 256×256

Exact 256×256 canvas, centered and never stretched — batch up to 50, in your browser.

Resize to 1200×630

Exact 1200×630 canvas, centered and never stretched — batch up to 50, in your browser.

Crop Image

Free-form or fixed ratios like 1:1 and 16:9.

Rotate Image

Turn images 90°, 180° or 270°.

Flip Image

Mirror images horizontally or vertically.

Watermark Image

Add a text watermark — position, size, and opacity.

Meme Generator

Classic meme text on any photo — no watermark, no signup, in your browser.

Add Text to Photo

Five font styles, custom colors, drag captions anywhere.

Blur Image

Pixelate any part of an image — drag to select, pick a strength, done in your browser.

Blur Faces

Automatically detect and blur faces in your photos — mosaic, soft blur or solid bar. Batch up to 50, all in your browser.

Black and White

Turn photos black and white in one click — batch up to 50, right in your browser.

Remove Background

Erase image backgrounds in one click — transparent PNGs, right in your browser.

Add White Background

Put product photos on a pure white background for listings — JPG or transparent PNG, right in your browser.

Passport Photo

Country-compliant passport & ID photos — made with AmiPhotos, our dedicated photo studio.