What is a .sketch file and why can't I open it normally?

A .sketch file is a proprietary format from the Sketch app (macOS only). It contains vector graphics, artboards, and design system data. Without a Mac and a Sketch license, you cannot open it natively on Windows or Linux—our tool solves this by parsing the format in-browser.

Can I open Sketch files on Windows 10 or Windows 11?

Yes. Our viewer runs entirely in Chrome, Edge, Firefox, or Safari on Windows 10 and Windows 11. Just drag the file into the browser window—no executable (.exe) installation or admin rights required.

Is my design data uploaded to your servers?

Absolutely not. The extraction and rendering happen 100% client-side using WebAssembly. Your file bytes never leave your browser tab, ensuring GDPR and NDA compliance for sensitive projects.

How do I export a specific artboard as PNG at 2x scale?

Select the desired artboard in the layer panel, click the 'Export' button, choose PNG format, set the multiplier to **2x** (or 3x for retina), and hit download. The asset saves directly to your local downloads folder.

Does it support Sketch 90+ file formats and features?

Yes. We continuously update the parser to support the latest Sketch versions (currently **Sketch 90+**). It handles modern features like Smart Layout, variable fonts, and Library symbols correctly.

Can I inspect CSS values for developer handoff?

Yes. Click any layer to open the Inspector panel. It displays computed CSS: `width`, `height`, `border-radius`, `box-shadow`, `font-family`, `line-height`, and color values (HEX/RGBA) ready to copy.

What is the maximum file size supported?

The tool supports files up to **100 MB**. Since processing is local, performance depends on your device RAM. For massive design systems (200MB+), we recommend splitting libraries into smaller files.

Does this Sketch Viewer work offline?

After the initial load, the application is cached via Service Worker. You can open and view .sketch files completely offline, making it reliable for secure air-gapped environments or travel.

Home Designer ToolsSketch Viewer Online Free

Sketch File Viewer & Inspector

Open, view, and inspect Sketch design layers directly in your browser. 100% client-side parsing. Perfect for developers, Windows, and Linux UI handoffs.

Client-Side JSON Schema Parsing Pipeline

Drop .sketch file here

or click to browse from your device100% Client-Side JSON Parsing. Windows & Linux friendly.

How to Inspect Sketch Files Offline

Extract coordinates, properties, and image assets from Sketch mockups locally in seconds.

Upload Design File

Drop your `.sketch` file into the ingestion dropzone. All extraction code executes locally inside standard browser memory buffers.

JSON Schema Parsing

The viewer parses `document.json` and page sheets recursively, dynamically mapping group bounds and artboard frames into the tree.

Inspect UI & Copy CSS

Hover over layouts to select shapes/text elements, copy formatted developer CSS styles, and download assets instantly.

100% Client-Side Sketch Engine

Inspect and parse nested Sketch layouts directly inside your web browser. By utilizing array buffers and local zip decompression, your vector templates and asset exports never leave your machine.

Complete Privacy Protection

Your .sketch archives are analyzed locally in browser memory. Absolute security with zero server uploads.

Real-Time Layer Control

Inspect vector shapes, groups, and text hierarchies, mapping absolute coordinates and margins inside an IDE environment.

Vibrant Multi-scale Exporter

Extract embedded image layers instantly to transparent PNGs or copy ready-to-use CSS declarations with a single click.

Raw Sketch

SkZIP

Layer Tree

100% Client-Side Engine Protection

Sketch Viewer Online FAQs

Answers to common questions about Sketch files, layer directories, and client-side conversion security.

How can I view a Sketch file on Windows or Linux?

Sketch files (since version 43) are ZIP packages containing JSON file layer sheets and asset previews. Our viewer parses these structures entirely inside your web browser locally, making it possible to inspect files on Windows and Linux without macOS software.

Is my Sketch design uploaded to any servers?

No. All decompression, JSON schema parsing, and image preview rendering happen 100% locally in your browser's private memory space. Absolutely zero data is sent to external web servers, protecting your artwork and layouts.

Can I download individual layers from the Sketch file?

Yes. When you select a layer in the DOM Layer Tree panel that contains an embedded image, the inspector desk reveals an 'Export Image Layer' button allowing you to download the raw high-resolution PNG/JPG asset from the package archive.

What Sketch formats are supported by this viewer?

All zip-based Sketch documents (version 43 and newer) are fully supported. Very old legacy binary format files generated prior to Sketch v43 are not supported by the client-side JSON parsing pipeline.

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