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live ยท in productionPrivacy-First AI Toolsince 2025

unbg

Remove Image Backgrounds Instantly & for Free

AI-powered background removal tool that runs 100% in the browser. No uploads, no sign-ups, no watermarks - just instant transparent PNGs.

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Next.jsReactTypeScriptTailwind CSS@imgly/background-removal
0%
Processing
Runs entirely in the browser - zero server uploads
$0
Cost
Completely free with no limits or watermarks
Total
Privacy
Images never leave the user's device
0 MB
Max File Size
Supports PNG, JPG, WEBP, HEIC uploads
unbg - slide 1
Overview

About this project

unbg is a free, privacy-first background removal tool powered by AI that runs entirely in the user's browser. Unlike cloud-based alternatives like remove.bg, unbg never uploads images to any server - all processing happens locally using an ONNX neural network model. It supports batch processing, a before/after comparison slider, manual brush editing (erase & restore), and high-resolution PNG downloads. Built with Next.js 16 and React 19, it delivers a premium, responsive experience on desktop and mobile.

Built for
  • E-commerce sellers needing fast product shots
  • Content creators on Instagram, TikTok, YouTube
  • Designers working in Figma, Canva or Photoshop
  • Photographers building composites
  • Real estate agents staging listings

The challenge

Existing background removal tools like remove.bg require uploading images to external servers, raising privacy concerns. Free tiers are heavily limited - low resolution, watermarks, or daily caps. Mobile users face additional friction with unsupported formats (HEIC) and poor touch experiences. Businesses and individuals needed a truly free, private, and unlimited solution.

Our solution

We built unbg to run AI background removal entirely in the browser using WebAssembly and the ONNX Runtime. The AI model downloads once (~80MB) and is cached for instant subsequent use. Images never leave the device, guaranteeing complete privacy. We added a full editing suite with a comparison slider and brush tools for manual refinement, batch processing for efficiency, and universal mobile support including automatic HEIC conversion.

Key features

  • 100% browser-based - no server uploads
  • AI-powered precision with ONNX neural network
  • Free forever with no watermarks or limits
  • Batch processing for multiple images
  • Before/after comparison slider
  • Manual erase & restore brush editor
  • Mobile-first responsive design
  • PWA-ready with offline model caching

Technology stack

Next.jsReactTypeScriptTailwind CSS@imgly/background-removalONNX Runtime WebWebAssemblyCanvas APIVercel
Use cases

Where unbg shines

01

E-commerce listings

Clean product shots for Amazon, Shopify, Etsy and eBay in seconds - no subscription required.

02

Social content

Cut out subjects for Instagram Reels, TikTok thumbnails, and YouTube covers without leaving the browser.

03

Design workflows

Drop transparent PNGs straight into Figma, Canva or presentation decks.

04

Photography

Headshots, passport photos, and composites with pixel-level brush refinement.

How we built it

The journey, end to end

  1. 1
    Phase 1
    Research
    Benchmarked cloud-based tools for speed, privacy, and cost. Identified ONNX Runtime Web as a viable local alternative.
  2. 2
    Phase 2
    Prototype
    Built a WASM pipeline that downloaded and cached an 80MB AI model entirely on the client.
  3. 3
    Phase 3
    Launch
    Added batch processing, brush tools, comparison slider and mobile HEIC conversion.
  4. 4
    Phase 4
    Polish
    Shipped a PWA with offline model caching, full touch support, and drag-and-drop batch uploads.
Under the hood

Core functionalities

AI-powered background removal running locally in the browser
Batch processing - upload and process multiple images at once
Before/after comparison slider with reveal animation
Manual brush editor with erase and restore modes
Adjustable brush size for fine-tuning results
High-resolution transparent PNG downloads
Batch download all processed images
Drag-and-drop and gallery upload support
Mobile-optimized with full touch support
HEIC/HEIF auto-conversion for mobile gallery photos
Outcomes

Results & impact

Eliminated all server-side image processing - 100% client-side
Zero cost to users - no subscriptions, credits, or watermarks
Full-resolution output with no quality degradation
Reduced background removal workflow from minutes to seconds
Universal mobile compatibility across all browsers and devices
Complete user privacy - images never transmitted over the network
Frequently asked

Common questions

Yes. There are no credit systems, daily limits, or watermarks. All processing happens in your browser, which is why we can offer it completely free.

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