PDF · 5 min read
How to Combine PDF Files Into One: Complete Guide for 2026
Step-by-step guide to merging multiple PDFs using our browser-based Merge PDF tool. No upload required, no software to install.
110+ tools · Free to start · No sign-up
Your Files. Your Browser. No Upload.
PDFs, emails, images and more, 110+ tools that run instantly in your browser.
No File Upload
Instant Results
120+ Countries
110+
Free Tools
47
Email Conversions
22
File Viewers
13yrs
In Operation
DMCA Protected
SSL Secured
ICO Certified
GDPR Compliant
ISO Certified
Google Partner
No Data Collection
Trusted by professionals at
Dropbox
Spotify
Netflix
Shopify
Salesforce
OpenAI
Stripe
Zoom
Notion
Atlassian
HubSpot
GitHub
Dropbox
Spotify
Netflix
Shopify
Salesforce
OpenAI
Stripe
Zoom
Notion
Atlassian
HubSpot
GitHub
What We Offer
6 Specialist Tool Categories, 110+ Tools Total
Comprehensive solutions for PDF management, email migration, file viewing, media processing, developer utilities and cloud backup.
29 Tools
PDF Tools
Merge, split, compress, rotate, sign, redact, watermark, lock, OCR, convert to Word and Excel. Every PDF operation is covered.
Merge PDF
OCR PDF
Sign PDF
Edit PDF
Explore PDF Tools
7 Converters · 47 Combinations
Email Converters
MBOX, PST, OST, EML, MSG, OLM, EDB. Convert between every major email format. Preserves headers, body and attachments.
MBOX to PST
PST to EML
OST to PST
Explore Converters
22 Viewers
File Viewers
Open EML, MBOX, PST, PDF, DOCX, PPTX, JSON, XML, ICS, TIFF, vCard and more, instantly in your browser. No software to install.
PST Viewer
EML Viewer
MBOX Viewer
Explore Viewers
10 Tools
Image & Media
Image converter, compressor, background remover, resizer, OCR, audio & video converter, subtitle generator and favicon creator.
Image Converter
BG Remover
Audio Converter
Explore Media Tools
24 Utilities
Developer & Utilities
QR code generator, Base64 encoder, hash generator, JSON formatter, regex tester, color picker, Markdown tools and more.
JSON Formatter
Base64
Regex Tester
Explore Dev Tools
21 Provider Pages
Email Backup
Provider-specific IMAP backup for Gmail, Outlook, Yahoo, Zoho, iCloud, Thunderbird and 15 more. Export to 15+ formats.
Gmail Backup
Outlook Backup
iCloud Backup
Explore Backup Tools
PDF Tools
29 Free PDF Tools to Edit, Convert and Manage PDFs
Every PDF operation you need, running privately in your browser. No installation. No account required.
Merge PDFPopular
Compress PDFPopular
Split PDF
Rotate PDF
Organize PDF
PDF to Image
Image to PDF
Add Watermark
Remove Watermark
Add Page Numbers
PDF Locker
PDF Unlocker
OCR PDFPopular
Sign PDFPopular
Redact PDF
PDF Metadata
Extract Images
Grayscale PDF
Repair PDF
PDF Manager
Crop PDF
Edit PDFNew
PDF to Word
PDF to Excel
PDF to Text
HTML to PDF
Word to PDF
PPT to PDF
WhatsApp to PDFNew
Email Migration
7 Email Converters · 47 Format Combinations
Convert between every major email archive format. Bulk jobs, date-range filters and attachments preserved.
MBOX Converter
9 output formats
→
PST Converter
11 output formats
→
OST Converter
7 output formats
→
EML Converter
6 output formats
→
MSG Converter
7 output formats
→
OLM Converter
3 output formats
→
EDB Converter
3 output formats
→
All Email Converters →
All 47 conversion pairs - click to open
MBOX→EML
MBOX→PSTHot
MBOX→MSG
MBOX→PDF
MBOX→CSV
MBOX→HTML
MBOX→TXT
MBOX→JSON
MBOX→EMLX
PST→EML
PST→MBOXHot
PST→MSG
PST→PDF
PST→CSV
PST→HTML
PST→TXT
PST→JSON
PST→MHT
PST→VCF
PST→ICS
OST→PSTHot
OST→EML
OST→MBOX
OST→CSV
OST→HTML
OST→TXT
OST→JSON
EML→PDF
EML→MBOX
EML→CSV
EML→HTML
EML→TXT
EML→JSON
MSG→EML
MSG→PDF
MSG→MBOX
MSG→CSV
MSG→HTML
MSG→TXT
MSG→JSON
OLM→PST
OLM→EML
OLM→MBOX
EDB→PST
EDB→EML
EDB→MBOX
XLSX→VCF
Format Support
Every File Format You Work With: PDF, Email, Image and Data
From everyday documents to specialised email archives, OnlinePCApps handles them all.
PDF Documents
PDFDOCXPPTXXPSHTMLRTF
Email Archives
MBOXPSTOSTEMLMSGOLMEDBDBXEMLX
Images & Media
JPEGPNGWebPAVIFTIFFBMPGIFICOMP3WAVMP4
Spreadsheets
XLSXXLSCSVTSVODSJSON
Contacts & Calendar
VCFICSCSVXLSX
Developer & Data
JSONXMLMarkdownHTMLBase64QR
Proof of Results
See What OnlinePCApps Actually Does
Real outputs from real workflows. No guesswork before you start.
Compress PDFPDF Tools
1
You start with
15.4 MB
A scanned report, too big to attach to an email.
2
Runs in your browser
Compressed on your device, nothing sent to a server.
3
You get
3.1 MB
80% lighter, with text and formatting untouched.
MBOX to PSTEmail Migration
1
You start with
2 GB MBOX
A decade of Gmail archive in mixed formats.
2
Runs in your browser
Rebuilt into a PST right inside the tab.
3
You get
Clean PST
Folders, threads and attachments, Outlook-ready.
Remove BackgroundImage Tools
1
You start with
Busy photo
A product shot lost in a cluttered background.
2
Runs in your browser
Subject cut out automatically, no manual masking.
3
You get
Transparent PNG
Drop-ready for listings, slide decks and design tools.
Industry Solutions
File Tools Built for Legal, IT and Forensics Teams
Specialised workflows for legal, IT, compliance, forensics, development and document management.
Legal Discovery
Convert email archives to court-ready PDF with full header and attachment preservation. Supports PST, EML, MBOX and MSG for eDiscovery workflows.
IT Migration
Move mailboxes between platforms across 47 conversion paths. No server-side processing means migrations stay within your network perimeter.
Compliance & Audit
GDPR-safe email archiving with no server upload. Create verifiable audit trails with timestamped exports for regulatory requirements.
Digital Forensics
Open DBX, PST, OLM and other legacy or proprietary email archive formats without the original software. Inspect and export evidence-grade data.
Developer Workflows
Base64, JSON, regex, hash, QR, color picker, timestamp converter. The daily developer toolkit in one fast, sign-up-free workspace.
Simple Process
How to Use Any Browser Tool in 3 Steps
No account. No install. No waiting. Your files never leave your device.
01
Pick a Tool
Search or browse 110+ tools for PDF, email, image or developer utilities. Find what you need in seconds with our live search.
02
Process Locally
Your browser does all the work using WebAssembly and modern browser APIs. Files never leave your device. 100% private and secure.
03
Download Instantly
Get your result in seconds. No queue. No server wait. Download directly or copy to clipboard. Your file is ready immediately.
The OnlinePCApps Promise
One tab, zero setup. Nothing to install, nobody to sign up as, and files that stay on your own machine.
No Installing
Quick jobs should not cost you a download, an update cycle and disk space.
No Account
Opening a single file should never start with a signup form and a password.
No Upload
If the tab can handle it, your data is processed right there and goes nowhere.
And when a job truly needs more than a tab can give, we tell you plainly and point you to the desktop app instead of pretending otherwise.
Do Not Take Our Word for It, Check It Yourself
Every privacy claim on the internet sounds the same. This one you can test in about ten seconds, in the browser you are already using.
1Open any tool on this site
2Press F12 and pick the Network tab
3Run your file through the tool
4No request carries your file out
Why OnlinePCApps
The Smarter Way to Work With PDF and Email Files
Privacy-first. Expert-built. 13 years of file format engineering, now available in your browser.
100% Private Processing
All computation runs locally in your browser via WebAssembly and modern browser APIs. Your files never touch our servers. Zero server-side storage of any kind.
Built by Experts Since 2013
Over 13 years of file format engineering behind every tool. Trusted by IT administrators, legal professionals and digital forensics teams worldwide.
Established 2013 · 13+ years of expertise
Instant Results
No queues. No waiting. Results are ready in seconds, powered by modern browser APIs for maximum speed, even for large files.
Works on Any Device
Windows, Mac, Linux, iOS and Android. No software to download. Just open your browser and start working on any screen size.
110+ Tools, One Platform
PDF, email, image, developer utilities and backup. Everything in one place. No juggling between multiple sites or paying for separate subscriptions.
Always Free Tier
5 free uses per tool per day, forever. No credit card required to start. Upgrade to Pro or Business when you need unlimited access and higher file size limits.
Why Switch
OnlinePCApps vs Desktop Software and Upload Tools
See how browser-based tools compare to desktop software and upload-based online tools.
| Feature | ✦ OnlinePCApps |
Desktop Software | Upload-Based Tools |
|---|---|---|---|
PrivacyFiles never leave your device |
✓ 100% Local | ✓ Local | ✗ Uploaded to server |
Installation required |
✓ None needed | ✗ Download & install | ✓ None needed |
Cost |
✓ Free tier + $12/mo | ✗ $50–$500 one-time | ~ Free/limited |
Cross-platform |
✓ All OS + mobile | ✗ Windows only | ✓ Any browser |
Tool count |
✓ 110+ tools | ~ 1–5 per software | ~ 10–30 tools |
Email format support |
✓ 47 combinations | ~ 3–10 formats | ✗ Limited |
Free tier |
✓ Always free, 5/day | ~ Trial only | ~ With ads/limits |
Updates |
✓ Always latest | ✗ Manual updates | ✓ Always latest |
User Reviews
Trusted by Professionals Worldwide
From legal discovery to digital forensics. Real users, real workflows.
"OnlinePCApps saved me hours converting 500+ EML files to PDF for a legal discovery request. The batch output was court-ready and every attachment was preserved perfectly. This is the best tool of its kind I have used."
"We migrated 200 user PST archives to MBOX during our M365 rollout. OnlinePCApps processed everything locally. Zero data exposure and zero compliance risk. The OST to PST tool alone saved us a week of manual work."
"As a developer I rely on the JSON formatter, regex tester, Base64 encoder and hash generator every single day. Having all these in one place without any sign-up or ads is genuinely refreshing. The tools are fast and accurate."
"For our GDPR audit trail we needed verified email exports with intact headers. The MBOX to PDF export gave us exactly what the auditors needed. Every metadata field was preserved. The browser-only processing meant full compliance."
Behind the Tools
A Real Office, Real Hardware, Real People
Free browser tools and a physical drive-recovery lab, run out of one office by one team.
Our front desk
Where the code is written
The recovery bench
Checking raw file data
Forensic drive station
Email · 7 min read
MBOX to PST Conversion: The Complete Migration Guide
Everything you need to know about converting MBOX archives to Outlook PST format, including folder mapping, attachment handling and the common pitfalls to avoid.
PDF Security · 4 min read
How to Password-Protect a PDF: Lock and Restrict Access
Add 128-bit AES encryption, restrict printing and copying or set a document-open password. All of it works directly in your browser, no file upload needed.