usefulweb.appDependable little tools for people and AI agents. Lumina

Photo editor & image toolkit

Lumina

Bring out what you saw. A free photo studio, right in your browser.

Lumina is a free photo editing studio that runs on your device. Develop light and color, try creative looks, crop and rotate, add text and watermarks, and export a finished image without uploading your photo; editable projects and browser autosave keep your work together. Photo Lab adds collages, contact sheets, image joining, animated GIFs, batch exports and image splitting. Tone Lab adds RGB curves, levels, neutral white balance, clipping warnings and reusable processing profiles. Design Layers combines images, text and shapes with transforms, blend modes and reversible masks.

Launch Lumina → Tutorials

Free · runs in your browser · no sign-up · Version 1.3.0

Lumina Tone Lab editing an alpine photograph with RGB histograms and a gentle five-point tone curve

Screenshots

Features

  • Find your light

    Exposure, contrast, highlights and shadows bring balance to your photo, with luminance and RGB histograms, levels, gamma and editable five-point tone curves.

  • Color with intention

    Temperature, tint, saturation and vibrance give you direct control over the mood. Sample a neutral patch for linear-light white balance.

  • Six starting points

    Original, Daylight, Golden hour, Cinematic, Silver and Soft light are editable looks, not permanent filters.

  • A stronger frame

    Use common aspect ratios or a custom crop, then rotate and flip. The original stays untouched.

  • The finishing details

    Classic sharpening, edge-aware smoothing, fade and vignette. Deterministic processing without AI models.

  • Leave your mark

    Add, position and duplicate text layers for captions, signatures and watermarks. Set color, size and opacity.

  • See the difference

    Slide between the original and edited photo. Inspect shadow and highlight clipping without affecting exports; undo and redo your changes.

  • Keep your originals

    Projects autosave on this device. Download an editable project, or save a settings-only processing profile to reuse in Photo Lab batch exports.

  • Ready for wherever

    Export JPEG, PNG or WebP at a chosen size and quality, or print using your browser.

  • A useful little toolkit

    Plan crops, resize dimensions and print sizes, analyze color contrast, or open the existing compression and batch image tools.

  • Photo Lab: better together

    Arrange photos into collages and contact sheets, join them horizontally or vertically, and control their order, spacing, fit and captions.

  • One look, a whole collection

    Capture a look and text layers, resize and convert a photo set locally, or slice one image into numbered tiles. Download the results in one ZIP.

  • Photos in motion

    Turn an ordered photo set into an animated GIF with frame timing and looping. Save editable Photo Lab projects and restore a local draft.

  • Build a composition

    Design Layers combines images, text, rectangles and ellipses on a custom canvas. Reorder, lock, hide and duplicate layers.

  • Place every element

    Move, resize, rotate and flip layers with canvas handles or exact numeric controls. Eight blend modes and opacity control the result.

  • Hide without deleting

    Rectangle and ellipse masks add inward feathering. Paint Hide or Reveal strokes, invert or disable the mask, and keep the original pixels.

Templates

Start from a ready-made project and change it to fit.

For AI agents

Lumina runs on a deterministic engine. The same functions are available as tools with a JSON API and MCP, so scripts and AI agents get exactly the results the app shows.

  • Photo Crop & Resize Planner – Plan a precise crop and output size before resizing a photo.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-resize-planner/calculate · MCP lumina_resize_planner
  • Photo Print Size Planner – Find how large your photo can print at your chosen resolution.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-print-planner/calculate · MCP lumina_print_planner
  • Photo Palette & Text Contrast – Check palette luminance and choose readable text for photos and graphics.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-color-analyzer/calculate · MCP lumina_color_analyzer
  • Photo Collage & Image Joiner – Make a photo grid or join photos horizontally and vertically.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-photo-layout/calculate · MCP lumina_photo_layout
  • Image Grid Splitter – Slice a photo into numbered tiles without losing edge pixels.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-image-splitter/calculate · MCP lumina_image_splitter
  • Photo to Animated GIF – Turn an ordered set of photos into a looping animated GIF.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-gif-maker/calculate · MCP lumina_gif_maker
  • Layer Transform & Bounds Planner – Calculate a layer transform, rotated corners and canvas bounds.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-layer-transform/calculate · MCP lumina_layer_transform
  • Layer Blend Color Mixer – Preview eight blend modes and opacity for two opaque colors.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-blend-mixer/calculate · MCP lumina_blend_mixer
  • Image Shape Mask & Feather – Clip a photo into a soft rectangle or ellipse with PNG transparency.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-image-mask/calculate · MCP lumina_image_mask
  • Photo Histogram & Clipping Analyzer – Inspect RGB histograms, clipped channels and tonal percentiles in a photo.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-histogram-analyzer/calculate · MCP lumina_histogram_analyzer
  • Photo Tone Curves & Profile Processor – Apply levels, RGB curves and white balance, or reuse a Lumina photo profile.
    Tool page · POST https://lumina.usefulweb.app/api/v1/tools/lumina-tone-processor/calculate · MCP lumina_tone_processor

Build a project through the API, then open it in the app with a link to https://lumina.usefulweb.app/app#project=<base64url JSON>.

Import & export

Import

  • Processing profile (.lumina-profile.json)
  • JPEG
  • PNG
  • WebP
  • GIF (first frame)
  • BMP
  • AVIF (browser support required)
  • Lumina project (.lumina.json)
  • Photo Lab project (.lumina-lab.json)
  • Design project (.lumina-design.json)

Export

  • Processing profile (.lumina-profile.json)
  • JPEG
  • PNG
  • WebP
  • Animated GIF
  • ZIP of batch images or tiles
  • Lumina project (.lumina.json)
  • Photo Lab project (.lumina-lab.json)
  • Design project (.lumina-design.json)
  • Print / PDF via browser print

Keyboard shortcuts

Keyboard shortcuts in Lumina
KeysAction
Ctrl + SSave editable project
Ctrl + OOpen a photo or project
Ctrl + ZUndo
Ctrl + Shift + ZRedo
Ctrl + C / Ctrl + V / Ctrl + DCopy / paste / duplicate text layer
DeleteDelete selected text layer
Arrow keysNudge selected text layer
FFit photo
GGrid and snapping
BCompare original and edited photo
?Help and shortcuts

Frequently asked questions

Can I reuse a Tone Lab edit?

Save a .lumina-profile.json file containing Develop controls, levels, RGB curves and white-balance gains, without photos, crop or text. Import it in Tone Lab or the main Open button. Photo Lab captures these settings for batch export. Camera PP3 and ICC profiles are not supported.

Does my photo leave my device?

The editor processes images locally and stores projects in this browser. The separate file utilities linked from Tools may upload files to the usefulweb.site server; they say so before you use them.

Is this a RAW developer or an AI photo editor?

Lumina works on browser-decodable images using display-referred sRGB adjustments and classic filters. It does not develop RAW files, replace skies, select subjects automatically or run AI restoration. Use the existing HEIC & RAW converter before opening those formats.

How do I keep an editable copy?

Use Save project to download a .lumina.json file containing your source photo, adjustment settings, crop and text layers. Photo Lab saves a separate .lumina-lab.json file with its photos, layout and captured batch look. Design Layers saves .lumina-design.json compositions; its schema is /static/apps/lumina/design.schema.json. Browser autosave is convenient, but browser storage can be cleared or evicted.

What happens to metadata?

Image exports are encoded from a canvas, so original EXIF and GPS metadata is not copied. Design project files keep the imported image bytes and may retain their metadata. Color processing uses the browser sRGB canvas pipeline; exported images do not preserve embedded profiles.

Can AI agents use the related tools?

Yes. The eleven companion tools cover resize and print planning, color analysis, photo layouts, image splitting, animated GIFs, layer transforms, blend colors, transparent shape masks, histogram analysis and tone-profile processing through HTML pages, JSON API and MCP. File-processing tools upload photos to the server.

Limitations

What Lumina does not do (yet):

  • Maximum 30 MB per photo and 16 megapixels after decoding; single-photo .lumina.json imports are limited to 60 MB.
  • sRGB display editing only; no RAW development, HDR, ICC soft proofing or professional print color management.
  • The photo editor uses text layers. Photo Lab adds layouts; Design Layers adds transforms, blend modes and geometric or brush masks. No PSD import, smart objects, healing or AI subject detection.
  • Noise smoothing and sharpening are classic local filters, not learned restoration.
  • GIF import uses one frame; animation is not preserved. AVIF import depends on browser support.
  • Photo Lab: up to 24 photos, 32 MP decoded in total, 16 MP output and approximately 60 MB of embedded sources. GIF output uses a fixed 256-color palette and at most 12 million total frame pixels.
  • Design Layers: 24 layers, eight image layers, 4 MP canvas and image limit, 24 MP of uniquely decoded images, 12 MB embedded source budget and 12000 brush points. No perspective warp or arbitrary vector paths.
  • Browser projects stay on this device; save a project file for a durable backup.

Tutorials

Learn Lumina step by step.

  1. Your first photo editOpen a photo, balance light and color, and export an image with Lumina.Beginner 4 min
  2. Crop, add text and prepare a printReframe a photo and add an editable caption or watermark.Beginner 5 min
  3. Make more from a photo collectionCreate a contact sheet, animated GIF, batch export or image grid in Photo Lab.Beginner 6 min
  4. Design with images, text and reversible masksBuild a layered cover, transform its elements, paint a mask and save an editable composition.Beginner 7 min
  5. Develop tones with curves and reusable profilesRead RGB histograms, set levels, sample a neutral white balance and reuse an edit across a photo collection.Beginner 8 min

Ready to try it?

Launch Lumina →

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