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📘 Guides

All 22 guides →
📐
Image sizesPixel sizes and aspect ratios for every major platform, with a worked example.
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Reduce photo sizeMeasured file sizes at different dimensions and quality levels, and a method for upload forms.
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Photos for online applicationsDimensions, KB ranges, mm-to-pixel conversion and rejection fixes.
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Faster website imagesMeasured savings from resizing and WebP, srcset and lazy loading.
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HEIC vs JPGWhy forms and Windows reject iPhone photos, and three ways to fix it.
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Percentage formulasThe three formulas, stacked discounts, VAT and percentage points.
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Character limitsPlatform limits, the SMS 160 vs 70 rule, and how emoji are counted.
 { }
JSON errorsReal error messages, what they mean, and how to fix each one.

Choose the tool that matches your task

Need a smaller image? Use Image Resizer for pixel dimensions (see our image size cheat sheet) or JPG to WebP to change format. If a website will not accept an Apple photo, start with HEIC to JPG.

For a writing limit, compare word count with character and byte counts. For a data payload, use JSON Formatter to check syntax. Base64 encoding is a separate task and does not encrypt the contents.

The tools work without an account. Inputs are processed locally in your browser; website analytics are described in our Privacy Policy. Each tool page explains its options and limitations.

Not sure which tool you need?

The guides explain image sizes, date counting, percentages, character limits and more, and each one links to the tool that does the job.

Browse the guides