Developer Tools

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Merge JSON Files

Combine multiple JSON files or snippets into one — merge objects, deep-merge, or concatenate arrays.

Live

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Extract HTML from a Website

Paste a URL and pull the full HTML source — view, copy, or download it.

Live

File Tools

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Image Editor & Compressor

Resize, adjust brightness/contrast/color, draw on, and compress images — all in your browser.

Live

Calculators

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Scientific Calculator

Full scientific calculator with trig, logs, and DEG/RAD modes.

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Logistics

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Dimensional Weight Calculator

Calculate chargeable shipping weight for FedEx, UPS, USPS & DHL.

Live

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Freight Class Calculator

Find your NMFC freight class from shipment density — updated to the current 13-tier scale.

Live

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Container Loading Calculator

See how many cartons fit in a 20ft, 40ft, or 40ft High Cube container.

Live

Merge JSON Files

Combine multiple JSON inputs into a single output. Nothing is uploaded — everything runs in your browser.

Merge strategy:

Output

Merged JSON will appear here…

Extract HTML from a Website

Paste any public webpage URL to pull its full HTML source.

Website URL

Browsers block a page from directly reading another website's code for security reasons, so this tool routes the request through a trusted, read-only fetch service to retrieve the page for you. No data you enter is stored — the URL is only used to fetch that one page. Some sites (especially those requiring login, or with strict bot protection) may not be extractable this way.

Dimensional Weight Calculator

Find the chargeable weight carriers will actually bill you for — the greater of actual weight and dimensional weight.

Carrier / divisor preset

Length (in)

Width (in)

Height (in)

Actual weight (lb)

Divisors shown are the standard published formulas used across the industry (e.g. 139 for FedEx/UPS in inches, 5000 for metric/DHL). Always confirm the exact figure with your specific carrier and service level, since rates occasionally change.

Image Editor & Compressor

Resize, adjust, draw on, and compress your image — everything runs locally in your browser, nothing is uploaded.

Drop an image here, or click to choose

Canvas

Crop

Click "Start Crop", then drag on the image above to select the area to keep.

Resize

100%

Presets and percentage only scale down — images are never enlarged beyond their original size. Applying a resize clears any drawing or background removal below, so resize first.

Adjust

Brightness 100%

Contrast 100%

Saturation 100%

Background Remover

Sensitivity 30

Detects and removes a solid, plain background (like a product photo on white or a single color) by clearing pixels similar to the corners of the image. Raise sensitivity for a background with slight shadows or texture. This works well for plain-background product shots, but won't cleanly separate complex backgrounds (busy scenes, hair, fur). Output automatically switches to PNG to preserve transparency. Didn't work as expected? Use Undo above the canvas.

Draw

Size: 8px

Draw directly on the canvas above with your mouse or finger. Switch between Pen and Eraser anytime.

Export

Quality: 80%

Format:

Estimated size: —

Freight Class Calculator

Find your LTL freight class (NMFC) from shipment density — the same formula carriers use to price your shipment.

Length (in)

Width (in)

Height (in)

Weight (lb)

Number of pieces

This calculates freight class from density alone, per the NMFTA's standardized density-based scale. It doesn't account for special handling, stowability, or liability factors that can shift the class for specific commodities — always confirm with your carrier before booking. Density table last verified against the current 13-tier NMFC standard: September 2026.

Container Loading Calculator

Find out how many cartons fit inside a shipping container, checking every orientation to find the best fit.

Container type

Carton dimensions

Length

Width

Height

Checks all 6 possible carton orientations and uses whichever fits the most, assuming cartons are stacked in a uniform grid (no interlocking or mixed orientations). Standard container interior dimensions are approximate and vary slightly by manufacturer — always confirm with your carrier before booking.