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Tips, guides, and tutorials for your files
developerHow to Turn Code into a Beautiful Image (for Slides, Docs and Social Media)
Share code on LinkedIn, X or in a presentation as a sharp, highlighted image instead of a blurry screenshot. Themes, backgrounds, readability tips — and why you should always add the text version too.
videoHow to Translate Subtitles (SRT, VTT) with AI, for Free and Offline
Translate an SRT or VTT subtitle file into French, Spanish, German, Italian, Portuguese or Dutch — or into English — while keeping the timings intact. How it works and how to get a good result.
imageDepth of Field Explained: Aperture, Focal Length, Distance and Hyperfocal
Why is the background blurry in some photos and sharp in others? Understand depth of field, the three settings that control it, the hyperfocal distance for landscapes, and calculate it for your camera.
pdfHow to Extract Text from a PDF (Copy Without Broken Lines)
Copying text from a PDF often gives broken lines, missing spaces or nothing at all. Here's why, and how to extract clean text from any PDF — including scanned ones.
generatorDynamic QR Code: What It Is, Static vs Dynamic, and How to Create One for Free
A dynamic QR code lets you change the destination after printing and count scans. Learn the difference with a static QR code, the trap of "free trials" that disable your codes, and how to create one that never expires.
videoHow to Compress an Audio File (WAV, FLAC, MP3) Without Ruining the Sound
Shrink a WAV recording, a podcast or a voice memo to send it by email or messaging app. Which bitrate for voice or music, MP3 or OGG, and what you lose (or don't) when compressing.
generalCharacter Limits on Social Media in 2026: X, Instagram, LinkedIn, TikTok, YouTube
How many characters for a post on X, an Instagram caption or bio, a LinkedIn post, a YouTube title or a Google meta description? All the limits, and the ideal lengths that actually perform.
developerJWT Explained: How JSON Web Tokens Work (with Examples)
What's inside a JWT, how the signature works, what the exp, iat and sub claims mean, and the security mistakes to avoid — with a decoded example.
pdfHow to Convert a PDF to JPG (or PNG) in High Quality
Turn PDF pages into images to post them on social media, insert them in a presentation or send them by message. JPG, PNG or WebP, which resolution, and how to keep text sharp.
designHow to Convert a PNG to SVG: Vectorize a Logo or an Image
Turn a pixelated logo or icon into a sharp, infinitely scalable SVG. How vectorization works, which images give the best results, and how to clean up the result.
imageHow to Add a Watermark to Your Photos (Text or Logo, Free)
Protect your photos and artwork before sharing them online: text or logo watermark, the right position and opacity, and the tile mode that's hard to remove.
generalEmail Attachment Size Limits: Gmail, Outlook, Yahoo, Proton (2026)
What's the maximum attachment size on Gmail, Outlook, Yahoo or Proton Mail? Why a 20 MB file can be refused, and how to send large files anyway.