Guides
Guides
Short, practical guides for getting real jobs done with Tools99's free browser tools. Every guide describes what the tool actually does — including its limits — and none of them claims search rankings, traffic, or results the tools cannot produce. New guides are added as the tools grow; guides are never copied from other sites.
How to merge PDFs into one file
Join several PDFs in the order you choose, in your browser, without uploading them.
Guide
How to compress an image to an exact size
Hit a portal upload limit such as 50 KB or 200 KB, and what to do when quality suffers.
Guide
How to convert HEIC photos to JPG
Make iPhone photos usable everywhere, and what you lose in the conversion.
Guide
How to make a QR code that actually scans
Generate a code, test it, and avoid the printing mistakes that make codes unscannable.
Guide
How to make a strong password — and keep it safe
Generate a long random password, store it properly, and avoid the mistakes that undo it.
Guide
How currency conversion works on this site
Where the rate comes from, what time it was fetched, and why it is not your bank rate.
Guide
How to compress a PDF
Shrink a PDF so it fits an upload limit, and check the result before sharing it.
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How to split PDF files
Split a PDF into separate files, or extract a page range into a new PDF.
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How to convert JPG to PDF
Turn JPG or PNG images into a single PDF, one image per page.
Guide
How to convert MP3 to WAV
Convert an MP3 file to WAV audio in your browser. Decoding only, not MP3 encoding.
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How to check your word count
Count words and characters in any text instantly, in your browser.
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How to resize an image to exact pixels
Type the exact width and height you need, keep proportions or stretch on purpose, and change format in the same step.
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How to take the audio out of a video as an MP3
Extract a video’s audio as a real MP3 at 128 kb/s, and what happens when a video has no audio track.
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How to turn a HEIC photo into a PNG
Make iPhone photos usable everywhere as ordinary PNG files, in your browser.
Guide
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