Guías y tutoriales
Guías paso a paso para tareas cotidianas con PDF, fotos y archivos.
Por ahora, estas guías están en inglés.
8 de octubre de 2026 · 2 min de lectura
How to compress a PDF for email (without making it unreadable)
Email services reject big attachments. Here's how to shrink a PDF under 10, 5 or 1 MB while keeping text sharp, and what to do when it still won't fit.
Leer la guía →7 de octubre de 2026 · 2 min de lectura
How to take a passport photo at home with your phone
Lighting, background, pose and printing: a practical guide to taking a passport or visa photo at home that meets official size rules.
Leer la guía →6 de octubre de 2026 · 1 min de lectura
How to combine PDF files into one, free and without software
Merge several PDFs into a single document in the right order, on any device, without installing anything or uploading your files.
Leer la guía →5 de octubre de 2026 · 1 min de lectura
HEIC to JPG: how to open and convert iPhone photos on Windows
Why iPhone photos are HEIC files, why Windows and many websites can't open them, and the quickest ways to convert them to JPG.
Leer la guía →4 de octubre de 2026 · 2 min de lectura
How to reduce a photo to 20 KB or 50 KB for online application forms
Exam, job and government portals often demand photos and signatures under a strict KB limit and exact pixel size. Here's how to meet both in one go.
Leer la guía →3 de octubre de 2026 · 1 min de lectura
How to sign a PDF without printing it
Add your signature to a contract, form or letter on your phone or computer in under a minute, with no printer, scanner or account.
Leer la guía →