LumenLab✳

On your device

Finishing touches, without the upload.

Resize, convert and compress your images right in your browser. Your file never leaves your device.

Use our saved 1024 × 1024 AI sample. No generation credit or file upload needed.

Canvas presets

JPEG uses a white background for transparency. Resizing does not invent missing detail.

Local tools: no account or generation allowance required. Only JPEG, PNG and WebP still images; animated files may lose frames.

◫

On your device

Results vary by browser and source. The exported file is what you should inspect before publishing.

Aspect ratio calculator

Plan your canvas before you generate. Enter a width and choose a ratio.

Calculated height: 800 px

01 ↗

A clear prompt beats a longer prompt

Turn a loose idea into a repeatable creative brief.

Read the guide →
02 ↗

Choose the canvas before the image

Composition starts with where your image will live.

Read the guide →
03 ↗

Smaller files. The same first impression.

A practical workflow for format, size and compression.

Read the guide →
04 ↗

Choose a workflow, not a winner

How to compare Firefly, Canva and Ideogram for your task.

Read the guide →
05 ↗

From a generated cup to a publishable image

A saved FLUX Schnell result, an honest visual review and a local export exercise you can repeat.

Read the guide →
06 ↗

Build a blog header that survives mobile

Three downloadable exports show what a centered crop removes and what margins preserve.

Read the guide →
07 ↗

PNG, JPEG and WebP: a downloadable comparison

The same 600 × 600 source frame, three real files, exact bytes and an explicit testing boundary.

Read the guide →
08 ↗

Keep, crop or regenerate? Review an AI image

Use the saved cup to distinguish a framing problem from a missing subject detail.

Read the guide →
09 ↗

Publish the image with context and accessible text

A practical handoff: filenames, captions, alt text, responsive layout and a downloadable review sheet.

Read the guide →
10 ↗

Six briefs tested: architecture, nature and illustration

See the original files, exact prompts and mismatches, including incorrect counts and unwanted lettering.

Read the guide →
11 ↗

A revised prompt adds a handle, but not a complete pedestal

A real before-and-after attempt with a partial improvement and an unresolved failure.

Read the guide →