Blog
Practical guides on browser tools & developer workflows
Written by Achraf A., founder of TheFreeAITools. Specific, hands-on articles based on building and using these tools daily.
- 7 min readPDFAI toolsprivacy
How to Summarize a Long PDF for Free Without Signing Up
You have a 60-page report and 10 minutes. Here's how to get a reliable summary in the browser without uploading it to an account-walled service — plus the two cases where AI summaries quietly mislead you.
Read article - 8 min readdeveloper toolsPythonJavaScript
Converting Python to JavaScript in the Browser: What Translates and What Breaks
Syntax converts in seconds; semantics don't. Here's the realistic workflow for porting a Python snippet to JavaScript, the three patterns that always need a human, and how to check the result fast.
Read article - 6 min readimagesemailcompression
How to Compress an Image to Under 100 KB for Email (Without It Looking Terrible)
Email clients choke on large attachments and inline images. Here's how I get a photo under 100 KB while keeping it sharp — the quality setting that matters, when to switch formats, and the resize-first trick.
Read article - 7 min readsecuritydeveloper toolsencoding
Base64 Is Not Encryption: The Security Mistake I See in Code Reviews Every Week
Base64-encoded strings look scrambled, and that trips up a surprising number of developers into thinking the data is protected. Here's what Base64 actually does, where it belongs, and what to use when you actually need security.
Read article - 8 min readsecurityauthenticationdeveloper tools
Reading JWT Tokens Without a Library: What Your Auth Headers Actually Contain
A JWT is three Base64url-encoded chunks separated by dots. Once you know that, you can read any token in a browser tab in 10 seconds. Here's how, and what to check when an auth bug goes dark.
Read article - 9 min readQR codesprinttesting
QR Codes for Print and Web: What the Spec Sheets Don't Tell You About Scan Rates
I generated and tested 40 QR codes at different sizes, error correction levels, and color contrasts to find the settings that actually scan reliably. The defaults are not always the right choice.
Read article - 6 min readsecuritypasswordsworkflow
Browser Password Generator vs. Password Manager: When Each Makes Sense
Both generate strong passwords, but they solve different problems. Here's the specific scenario where I reach for the browser generator instead of 1Password, and why the distinction matters for shared accounts and one-time use.
Read article - 8 min readCSSdesignfrontend
CSS Box Shadows That Look Natural: The Numbers Behind the Effect
Most box shadow tutorials give you a single value and call it a day. Real shadows don't work that way. Here's a breakdown of the five parameters, why ambient and key layers should be separate, and the specific values I use in production.
Read article - 7 min readaccessibilitydesignCSS
Color Contrast Ratios: What WCAG AA and AAA Actually Mean in Practice
The 4.5:1 minimum ratio for text passes WCAG AA — but it can still fail badly on real screens with glare, aging eyes, or low brightness. Here's how I test contrast in practice and where the spec falls short.
Read article - 9 min readdeveloper toolsschedulingDevOps
Cron Syntax: The Parts That Bite You (And How to Test Before Deploying)
Cron expressions look simple until your scheduled job runs at 3 AM on a Tuesday instead of every Tuesday at 3 AM. Here's a breakdown of every field, the common mistakes, and how to validate a cron expression before it goes live.
Read article - 8 min readaudiobrowser APIsprivacy
How to Extract Audio from a Video File in Your Browser (No Upload, No App)
Zoom calls saved as MP4, lecture recordings, DJ sets, raw interview footage — here's how to strip the audio track client-side using the Web Audio API, with specific numbers on what you can expect.
Read article - 10 min readimagesperformanceweb.dev
Image Compression in Practice: From 3.2 MB to 412 KB Without Visible Quality Loss
I ran 60 JPEG and WebP images through the browser-based compressor to find the quality setting sweet spot. Here's what the data says about bitrate, color depth, and when to stop compressing.
Read article - 7 min readdeveloper toolssecurityJSON
Why You Should Format JSON Locally, Not in a Cloud Paste Tool
API responses containing tokens, PII, or business logic get pasted into cloud formatters every day. Here's what actually happens to that data and how browser-based formatting works differently.
Read article - 9 min readdeveloper toolsregexworkflow
How I Test Regex Before It Breaks Production: A Practical Workflow
Regular expressions are the one code construct where a single wrong character silently changes behavior with no compile error. Here's the workflow I use to test regex safely before it ships.
Read article - 7 min readwritingSEOproductivity
Word Count as a Writing Tool: How Counting Characters Changed How I Write
Word counters seem trivial until you use them seriously. Here's how I use character counts, reading time estimates, and density metrics to actually improve writing quality — not just hit targets.
Read article - 8 min readSQLdatabasesdeveloper tools
SQL Formatting as a Debugging Tool: Reading Queries You Didn't Write
Unformatted SQL is where bugs hide. Here's how I use SQL formatting as the first step in diagnosing slow queries, wrong joins, and logic errors in queries written by ORMs or other developers.
Read article - 7 min readprivacymarketingURLs
URL Shorteners: What They Actually Track and When to Use Your Own
Short links look clean, but they're also tracking infrastructure. Here's what click data gets collected, the 301 vs 302 distinction, and when you should use your own domain instead of a third-party service.
Read article - 8 min readMarkdowndeveloper toolsdocumentation
Markdown to HTML: The Conversion Gotchas That Cost Me an Afternoon
Markdown is almost a standard — but different parsers handle tables, nested lists, code blocks, and inline HTML differently. Here are the specific conversion issues I ran into migrating a 340-page documentation site.
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