CoolUtils Online PDF Merger

CoolUtils Online PDF Merger is a browser tool for combining PDF files and common images into one PDF. It suits people who need an occasional merge without installing software or creating an account. Its focused workflow is convenient, but the small per-pass cap and lack of page-level control make it a poor fit for larger or more exacting jobs.

Overview

The tool combines multiple files into a single PDF, with the final document following the upload slots from top to bottom. JPG, PNG, and GIF files can be included alongside PDFs; each image becomes a page. This makes it useful for assembling a few documents and scans in one pass, but users cannot select or rearrange individual pages within a file.

Each pass accepts up to five files, with a maximum of 50 MB per file. Those limits keep the service oriented toward small jobs rather than folder-level or recurring work. CoolUtils recommends its desktop PDF Combine product for those workflows and points users seeking command-line automation to that product.

Key features

• PDF and image merging: Add JPG, PNG, and GIF images as pages in the same output as PDFs. That avoids a separate image-to-PDF step for simple compilations.
• Upload-slot ordering: Arrange whole files in the desired top-to-bottom order before merging. With no page selection, it cannot serve workflows that require removing or repositioning pages inside a source document.
• Privacy and transfer protections: CoolUtils says uploads and downloads use encrypted SSL/TLS connections and files are processed in isolated environments. It says documents are used for the merge and not stored afterward, while also saying uploads and converted results are automatically deleted from its servers within 24 hours. It states commitments to GDPR and US privacy laws, but does not advertise formal ISO 27001 or SOC 2 certification.
• Support: CoolUtils says it provides human support and usually answers requests the same day, a useful option when a one-off merge runs into trouble.

Pricing

The Online PDF Merger plan is free: free. It includes up to five files per pass, a 50 MB maximum per file, and support for PDF, JPG, PNG, and GIF. There is no free trial because the tool is already offered as a free plan. The absence of a paid online tier keeps occasional use straightforward, but the file and pass caps remain; this is not a paid route to larger batches or page-selection controls.

Platforms

The primary platform is the web, and the merger runs in a browser without requiring software installation. CoolUtils lists Android, iOS, Linux, macOS, and Windows among its platforms, but the online merger itself is a browser-based tool.

Who it's for

This is a sensible choice for someone who needs to join a handful of PDFs, perhaps adding a few image pages, and values a browser workflow with no signup. It is less suitable for repeated or folder-level tasks, command-line automation, or edits that depend on controlling individual pages. CoolUtils has provided file-conversion tools since 2003 and says its tools cover more than 1,400 file types, but that broader background does not change the merger's narrow per-pass limits.

Pros and cons

• Pros: Free, browser-based merging without signup or installation; accepts common image formats as PDF pages; whole-file order is controlled by the upload slots.
• Cons: Five files per pass and 50 MB per file limit larger merges; no batch processing or page selection; the online page does not list integrations and directs command-line users to the desktop product.

Alternatives

For a wider comparison, see PDF Merger Software.

• HiPDF is worth considering when batch processing or OCR access matters: its Basic plan is $39.95 a year, billed annually, and includes web access, OCR access, batch processing, and a 100 MB maximum file size. It also has a free plan and a free trial.
• PDF Candy offers a free web-and-desktop plan, but its free tier has page and hourly restrictions, limited file size, and no batch processing. Choose it when desktop access alongside web tools is more useful than CoolUtils' stated per-file cap.
• PDF24 Compare PDF is another free option; its plan is described as having no limits, no registration, and no time restrictions, and is funded by advertising.
• LightPDF has a free plan with web-only access, a 10 MB maximum file size, five cloud files for one year, and an AI Agent allowance of three questions per day. Its stated file cap is lower than CoolUtils' 50 MB limit.
• Smallpdf has a free plan with 30+ tools and two Sign.com documents per month, plus a free trial lasting seven days. Consider it when that broader tool set or trial access fits the job better.
• AvePDF offers more than 50 document tools on its free plan, with two processing operations per six hours, a 128 MB maximum file size, and up to 10 files per processing. Its stated caps make it a possible fit when a merge exceeds CoolUtils' five-file limit, provided the operation allowance is sufficient.
• PDFgear is free and supports up to 100 MB per PDF for its online editor, which may suit a user whose individual PDF exceeds CoolUtils' 50 MB cap.
• Sejda PDF Editor is an alternative for readers comparing PDF editors.

Verdict

Choose CoolUtils Online PDF Merger for a free, occasional browser merge of up to five PDFs or image files, when arranging whole-file order is enough. Its straightforward access and image support are the main reasons to use it; look elsewhere for batch or folder-level work, larger sets, or page-by-page control.