Guides and answers
37 practical guides on getting files the size, shape and format you actually need. Every one links to the FileCrisp tool that does the job.
· 5 min read
Converting a PDF to JPG: Which Resolution to Pick
DPI is the only setting that matters when turning PDF pages into images. What each value is for, why higher is not better, and when to extract instead.
· 5 min read
How to Reverse the Page Order of a PDF
Why sheet feeders produce back-to-front documents, how to reverse a PDF in one step, and how to fix a scan where only some pages went in the wrong way.
· 6 min read
Watermarking a PDF: What It Actually Protects
A watermark deters casual sharing and identifies a copy. It does not secure a document. What each placement is for, and where the real protection lies.
· 6 min read
How to Add Page Numbers to a PDF
Number an existing PDF without converting it to Word first. Where the number should go, when to use '1 of 12', and how to handle an unnumbered cover.
· 6 min read
How to Rotate a PDF and Actually Save It That Way
Why the rotate button in your PDF viewer does not stick, how to save the rotation into the file, and how to fix only the pages that came out sideways.
· 6 min read
Browser-Based vs Server-Based File Tools: What Actually Differs
The choice decides privacy, speed, limits and offline use. A structural comparison of where the work happens, and which approach wins for which job.
· 6 min read
Free PDF Tools That Don't Upload Your Files
Every option that keeps a PDF on your device — built-in OS tools, browser-based sites and desktop software — with what each is genuinely good and bad at.
· 7 min read
How to Compress a PDF Without Uploading It Anywhere
Shrink a PDF without sending it to anyone's server. How browser-based compression works, when it is the only sensible option, and how to verify the claim yourself.
· 5 min read
File Tools That Work Offline, With No Installation
Compress, convert and resize files on a plane or with no signal. How a browser tab keeps working without a connection, what it can and cannot do, and how to set it up.
· 5 min read
Using File Tools at Work Without Creating a GDPR Problem
Uploading a client document to a free web tool can make that service a processor under the GDPR. What that means in practice, and how local processing avoids it.
· 6 min read
Is It Safe to Upload Documents to Online Tools?
What actually happens to a document you upload to a free web tool, which risks are real and which are overstated, and how to decide per document rather than per site.
· 6 min read
How to Tell Whether a File Tool Actually Uploads Your Files
Every file tool says it is private. Here is how to check in thirty seconds, using a panel already built into your browser — no trust required.
· 6 min read
How to Extract Pages From a PDF Without Acrobat
Pull specific pages out of a PDF, or split one into separate files — free, in your browser, with nothing uploaded and no page limit.
· 5 min read
How to Batch Compress Images Online Free — All Formats at Once
Compress hundreds of PNG, JPEG, and WebP images in one click. Drop your folder, set quality once, download a ZIP. Free, in-browser, nothing uploaded.
· 5 min read
Best Aspect Ratios for Instagram, YouTube, LinkedIn & More
The exact aspect ratios for Instagram, YouTube, LinkedIn, X and Stories — and how to crop to them free, without your photo leaving your device.
· 5 min read
How to Combine PDF Files on Windows 11 Free — No Adobe
Windows 11 has no built-in PDF merger. Combine PDFs for free using FileCrisp in Edge or Chrome — no Adobe, no download, done in 30 seconds.
· 5 min read
How to Combine Multiple Photos Into One PDF Free (No App)
Combine receipts, ID scans, evidence photos, or portfolio images into a single PDF document — free, in your browser, no app to install.
· 5 min read
Compress Images for Email Attachments — Stay Under Size Limits
Gmail limits attachments to 25 MB. Outlook to 20 MB. Compress images before attaching — free, instant, no upload, no watermark.
· 6 min read
How to Compress Images for WhatsApp, Telegram & Messaging Apps
WhatsApp compresses images automatically — and ruins quality. Compress them yourself first to control the result. Free, instant, no upload needed.
· 6 min read
Compress PDF for Email: Gmail & Outlook Limits
PDF too large to email? Gmail limits attachments to 25 MB, Outlook to 20 MB. Compress PDF files online free — no Adobe, no upload, instant results.
· 5 min read
Compress PDF Without Losing Quality
Structural compression shrinks PDFs 5–20% with zero quality loss. Rasterising shrinks 60–90% but text becomes an image. Here's when to use each method.
· 5 min read
How to Convert Images Between Formats Without Losing Quality
Not all image conversions are safe. PNG→WebP is lossless. PNG→JPEG always loses quality. This guide explains every conversion path and how to do it right.
· 5 min read
How to Convert JPEG to PNG Online Free (Keep Transparency)
Need a transparent background or lossless quality? Convert JPEG to PNG free in seconds — no Photoshop, no upload. Works on any device.
· 5 min read
How to Convert PNG to WebP Free Online — No Software Needed
PNG files are 5–10× larger than WebP. Convert any PNG to WebP in 3 clicks — free, in your browser, with zero quality loss. No Photoshop, no install.
· 5 min read
Electronic vs Digital Signature: The Difference
Electronic signatures and digital signatures are not the same thing. This guide explains the difference, when each is legally valid, and which one you need.
· 5 min read
How to Extract Images From a PDF Without Software
Extract every page of a PDF as PNG or JPG images — no Acrobat, no software. Drop your PDF, download your images as a ZIP. Free, in-browser, nothing uploaded.
· 5 min read
PDF Too Large to Email? Make It Smaller Free
Gmail limits attachments to 25 MB, Outlook to 20 MB. Here's exactly how to compress any PDF small enough to email — free, in your browser, nothing uploaded.
· 5 min read
How to Make a Photo Look Like a Scanned Document Free
Turn any phone photo into a professional scanned document — grayscale, B&W, or color enhanced. Free, in your browser, no scanner or software needed.
· 5 min read
How to Merge PDF and Word Documents Into One File (Free)
Can't directly merge .docx and .pdf? Convert Word to PDF first (it takes 10 seconds), then combine both in FileCrisp. Free, private, no upload.
· 5 min read
Reduce Image File Size Without Losing Quality
How to compress PNG, JPEG and WebP images for the web without visible quality loss — free, in your browser, with nothing uploaded.
· 5 min read
How to Reduce PDF File Size on Mac, Windows, and Mobile (Free)
Reduce PDF file size on any device — Mac, Windows PC, iPhone, or Android. FileCrisp works in any browser, no install needed. Free, private, instant.
· 5 min read
Resize an Image Without Losing Quality
Resizing down is always safe. Resizing up blurs. Learn the right way to resize images for web, print, and social media — free, in your browser, no upload.
· 5 min read
Resize Images for Website Speed: Right Sizes
Oversized images slow your site. Learn the right image dimensions for hero images, blog posts, thumbnails, and avatars. Resize free in your browser.
· 5 min read
Resize Images to YouTube Thumbnail Size (1280×720) Free
YouTube thumbnails must be exactly 1280×720 pixels (16:9) and under 2 MB. Resize any image to the right dimensions in seconds — free, no watermark, no upload.
· 5 min read
How to Scan Documents Without a Scanner
You don't need a scanner. Use your phone camera and FileCrisp to produce professional-quality scanned documents — free, in your browser, nothing installed.
· 5 min read
Social Media Image Sizes 2026 — Complete Guide (All Platforms)
Exact image dimensions for Instagram, YouTube, Twitter, LinkedIn, Facebook, and OG images in 2026. Plus a free tool to resize to any size instantly.
· 7 min read
WebP vs JPEG vs PNG: Which to Use, and When
WebP is 30% smaller than JPEG at the same quality. PNG is lossless but huge. JPEG is everywhere but dated. Here's exactly which format to use and when.