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File Converters TIFF and PDF apps Forensic FreewareThe free online mail converter that transforms EML, MSG, PST, and MBOX files into PDF, HTML, Word, and more — no software required.
CoolUtils online mail converter supports all major email formats as input — EML, MSG, PST, OST, and MBOX — and converts them to PDF, HTML, DOC, TXT, JPEG, and other output formats. Upload the file, select the output format, and download the converted document in seconds. No installation, no registration, completely free.
1) Upload PST file to convert
Drop files here, or Click to select
Allowed file types: pst, ost, eml, msg, mime, smime, p7m, mbox, dbx, vcf, vmbx, opf, asice, cpgz, lzh, zcf
2) Set converting PST to PDF options
3) Get converted file
Total Outlook Converter
Convert Outlook emails from multiple sources to a variety of formats.Filter emails by sender, subject, date, keywords, and more.Useful data saving options - convert only necessary data from your emails.Unique output files formatting options specify how your files will look.Affordable Price - pay once for a lifetime license with no hidden fees.Command Line Support - convert emails via command line.Fast batch conversion - convert multiple emails simultaneously.High security options - protect your output PDF files (if you choose PDF).Various file naming and date saving options - organize your output files easily.Variety of attachment saving options - choose how to save attachments.Trust - you can rely on powerful email converters from CoolUtils.Easy to use even for beginners - enjoy clear user-friendly interface.💾 Upload Your File: Go to the site, click on «Upload File,» and select your PST file.
✍️ Set Conversion Options: Choose PDF as the output format and adjust any additional options if needed.
Convert and Download: Click 👉«Download Converted File»👈 to get your PDF file.
| File extension | .PST |
| Category | Document File |
| Description | PST files are intended for storing mail elements on PCs, which include mail folders and their content. PST stores copies of these elements locally, and they are supported by well-known and common applications, particularly Outlook. Users can get to their emails even when there is no stable IT connection. PSTs can be accessed via whatever version is installed on your PC. Files saved in later versions use Unicode can hold a lot more data than those created in earlier ones, which use ANSI. Users who prefer not to use this program may choose to convert messages to other formats and open them in third party utilities. |
| Associated programs | Microsoft Outlook |
| Developed by | Microsoft |
| MIME type | |
| Useful links | PST to PDF Converter More detailed information on PST files |
| Conversion type | PST to PDF |
| File extension | |
| Category | Document File |
| Description | Adobe Systems Portable Document Format (PDF) format provides all the contents of a printed document in electronic form, including text and images, as well as technical details like links, scales, graphs, and interactive content. You can open this file in free Acrobat Reader and scroll through the page or the entire document, which is generally one or more pages. The PDF format is used to save pre-designed periodicals, brochures, and flyers. |
| Associated programs | Adobe Viewer Ghostscript Ghostview Xpdf CoolUtils PDF Viewer |
| Developed by | Adobe Systems |
| MIME type | application/pdf application/x-pdf |
| Useful links | More detailed information on PDF files |
2022-05-03
PST (Personal Storage Table) is Microsoft Outlook's binary archive format — it stores emails, calendars, contacts, and tasks in a single proprietary file. Opening a PST file requires a working Outlook installation. Converting PST to PDF produces a portable, court-admissible document that opens on any device, preserves full headers and metadata, and needs no email client to read. Each email becomes a PDF page with From, To, Subject, Date, message body, and attachments included.
PST stands for Personal Storage Table. It is the local data file that Microsoft Outlook uses to store a copy of mailbox contents — emails, sent items, drafts, calendar appointments, contacts, and tasks. PST files use the Compound File Binary Format (CFBF) with MAPI property encoding, the same underlying structure as .msg files.
PST files are created in several ways:
PST files differ from OST files: OST is a synchronized offline cache tied to a specific Outlook profile, while PST is a portable, self-contained archive you can copy and open anywhere Outlook is installed.
| Property | PST | |
|---|---|---|
| Viewer required | Microsoft Outlook (paid license) | Any browser, OS, or device — free |
| Headers preserved | Yes (MAPI properties) | Yes (rendered in full) |
| Attachments | Embedded (MAPI) | Embedded or extracted alongside |
| Search | Outlook search (index required) | PDF text search in any viewer |
| Legal admissibility | Native format (requires Outlook) | Widely accepted; non-editable record |
| eDiscovery platforms | Ingested by Relativity, Nuix, etc. | Directly viewable; Bates-stampable |
| File size | Compact (binary MAPI) | Larger (each email as PDF page) |
| Archival standard | None (proprietary) | PDF/A (ISO 19005) available |
The converter reads the PST file using MAPI property parsing, walks the folder tree, and exports each email message as a formatted PDF page. Each page includes the complete header block (From, To, Cc, Bcc, Subject, Date, Message-ID), the rendered message body (HTML or plain text), and a listing of attachments. Inline images (Content-ID MIME parts) are embedded in the page. The folder hierarchy — Inbox, Sent Items, custom folders — is preserved in the output structure.
JPEG images inside email bodies are embedded without recompression; HTML formatting (bold, tables, links) is rendered faithfully. Password-protected PST files must be unlocked before upload.
PST files vary enormously in size. A single year's emails for a typical knowledge worker is 1–3 GB; a decade of a senior executive's mailbox can reach 20–50 GB. The online converter accepts PST files up to 50 MB — suitable for short-term archives and small mailboxes.
For corporate-scale PST archives:
