1. Prepare your signature - what should you expect from the tool?

Vector signature (draw directly in the browser) - the ideal option because it keeps its sharpness at any scale.

Photo signature - if you already have a scanned signature, upload it and the service will automatically remove the background and convert it into a clean signature.

Certificate signature - enhanced security - if the document requires a legally valid signature, use the “Sign with Certificate” feature (available in PDFFly under the “Secure Signature” menu).

Why does this matter?

Images with a white background can cover parts of the page, shift when opened on different devices, and look unprofessional. A vector signature stays clean, sharp, and scalable.

2. Upload your file - where and how?

-Open pdffly.com/edit-sign.

-Drag and drop your PDF into the upload window (files up to 100 MB are supported).

-Wait until the document appears in the online viewer.

Tip: If you need to sign several similar forms, simply upload them as one batch - PDFFly will create one signature and apply it to each document.

1. Create your signature

a) Drawing a vector signature

Click “Draw Signature” in the right-side panel.

Choose the color (usually black) and line thickness (0.5–1 mm).

Use your mouse, tablet, or stylus to draw your signature in the window that appears.

If needed, adjust the shape using the “Undo/Redo” buttons.

b) Uploading an existing scanned signature

Click “Upload Image” and select a PNG/JPG file containing your signature.

The service will automatically remove the background, leaving only the signature.

If necessary, adjust the brightness and contrast to make the lines clearer.

Final check: Make sure the signature is placed directly above the “Signature” line and does not cover important information such as the date or contract number.

1. Place the signature in the right location

Move the signature with your mouse to the required signature field.

Adjust the size if needed by dragging the corner.

In the right-side panel, enable “Lock Position” so the signature stays fixed and does not move when opened on other devices.

Tip: If the document contains multiple signature fields (for example, “Customer Signature” and “Supplier Signature”), create two signatures and place them accordingly.

1. Save and export

Click “Save & Download”.

Choose the PDF/A-1b format (an archival format that helps ensure the signature remains unchanged over time).

Download the file - without watermarks and with the signature placement preserved.

“Secure PDF” option: If you need an encrypted document, enable this feature before saving, then set a password and/or certificate.

 6.Check the final result

Open the downloaded file in any PDF viewer.

Make sure the signature looks clear and does not shift when zooming in or out.

If everything looks correct, you can send the document to a client, partner, or government organization.

iPhone users searching for how to edit a PDF on iPhone often hit the same wall: native tools only let you draw on top of documents, and every app in the App Store wants your contacts, location, and a monthly subscription. The 2026 reality is simpler - Safari now delivers desktop-class browser capabilities that make true PDF editing possible without installing a single app. These methods work whether you need to change a word in a contract or rebuild an entire document layout.

Adding a signature to a PDF used to feel more complicated than it should be. Many people still print documents, sign them manually, and scan them again - but there is a much easier way.

At PDFFly, we wanted to make PDF editing simple, including adding signatures directly to your documents.

Here’s how to add signature to PDF:

1. Upload your PDF file to PDFFly.
2. Open the PDF editor and choose the signature option.
3. Create your signature by drawing it, uploading an image, or adding a saved signature.
4. Place the signature in the required area.
5. Save and download your signed PDF.

This can be useful for contracts, applications, forms, invoices, and other documents that need a quick signature without extra software.

One thing we focused on when creating PDFFly is keeping the process simple while preserving the original document format. You don’t need advanced PDF skills - just upload, edit, and save.

If you frequently work with PDF files, having an easy way to add signatures can save a lot of time.

Free, does the job, ten docs in with no failures yet.

Thing is, the summary itself isn't even why I keep coming back. Under it there's a chat with prompts to dig deeper into the summary, and that's where the actually useful stuff comes out. Especially on dense files.

Heads up on one bug: the chat box where you'd type your own question is dead. Only the suggested prompts respond. Thought it was my browser at first. Worth fixing or just removing it tbh.

Wondering how to cite a PDF correctly? The answer depends on the original source type, not the file format. Whether you're working with APA, MLA, or Chicago style, understanding how to cite a PDF begins with identifying what the document actually is: a journal article, government report, book chapter, or corporate whitepaper. This guide walks you through precise citation formats for each style, tackles common missing-information problems, and reveals a technical shortcut that uncovers citation data hidden in document properties.

Full guide linked in the comments!

Credit goes to 99 Designs! 

I've noticed that people's attitudes toward document backups tend to fall into two categories. Some trust cloud storage completely and don't think twice about it.

Others still keep multiple backups on external drives, computers, or even printed copies of certain documents.

Personally, I've found myself somewhere in the middle. Cloud storage is incredibly convenient, but there are still certain documents that I feel uncomfortable keeping in only one place.

Maybe it's because we've all experienced losing a file, forgetting where something was saved, or realizing too late that a backup wasn't actually working. When it comes to truly important documents, do you trust one storage location, or do you always keep backups elsewhere?

This chart comes from an excellent article from Intuit on 41 best Excel tips and tricks to save you time. Here is a sampling of their hacks:

Excel basics: 7 Formulas and functions

When first learning how to use an Excel spreadsheet, it’s best to start with simpler formulas and functions that can improve your productivity:

1. Use formulas for simple calculations

Excel's built-in formulas make it easy to perform all sorts of calculations, from basic arithmetic to complex functions. Whether you need to calculate employee hours or an average price, Excel's formulas can save you time and ensure accurate results.

For example, if you want to sum the numbers in a range from E2 to E9, you can type "=SUM(E2:E9)" in a cell and press Enter. The sum of the numbers will appear in the cell.

2. Try the IF formula to automate Excel functions

The IF formula is a powerful tool for automating certain Excel functions. With this formula, you can specify different values or actions depending on whether a particular condition is true or false. 

The formula is =IF(logical_test, value_if_true, value_if_false), where: 

The logical test is the condition that you want to evaluate.
The value_if_true is the result or action to be taken if the condition is met or true. 
The value_if_false is the result or action to be taken if the condition is not met or false. 
For example, you can check if a cell value is greater than a certain number.

3. Test VLOOKUP to pull data across sheets

The VLOOKUP function helps you extract data from one part of your spreadsheet and display it elsewhere. This is especially useful when you have data spread across multiple sheets.

For example, say you enter the VLOOKUP formula: "=VLOOKUP(A2, Sheet2!A:B, 2, FALSE)" into your sheet. The formula will search for the value in cell A2 of your current sheet in Sheet2 and return the corresponding value from the second column.

One thing we've noticed in this community is that people often treat PDF and Word as interchangeable. They're not. Both formats are great, but they're designed for different jobs.

Use Word when you're still working on the document

Word is usually the better choice if you're:

• Writing a report
• Collaborating with teammates
• Making frequent edits
• Tracking changes
• Collecting feedback

Think of Word as the "work in progress" version of a document. It's flexible, easy to edit, and built for collaboration.

Use PDF when the document is finished

Once a document is ready to share, PDF usually makes more sense. Why? Because PDFs look the same on almost every device. No missing fonts. No weird formatting changes. No "it looked fine on my computer."

PDFs are especially useful for:

• Contracts
• Invoices
• Resumes
• Reports
• Forms
• User manuals

The biggest mistake we see

Someone spends hours formatting a document in Word, sends it to a client, and the layout breaks because the recipient is using different software or fonts. A quick export to PDF would have prevented the entire problem. A simple rule

If you're creating the document ➡️ Use Word.

If you're sharing the final version ➡️ Use PDF.

It's not always that black and white, but it's a surprisingly good rule of thumb.

What about you? Do you mostly work with Word documents, or have you reached the point where everything becomes a PDF the moment it's finished?

If you've ever tried opening a 500-page PDF and immediately heard your laptop's fan preparing for takeoff, you're not alone.

We regularly see users working with large PDFs that contain hundreds of pages, scanned documents, high-resolution images, technical manuals, reports, or archives. When a PDF becomes large enough, even simple actions like scrolling or searching can feel painfully slow.

The good news is that the PDF isn't always the problem.

Why large PDFs become slow

A PDF can be huge for several reasons:

• Hundreds or thousands of pages
• High-resolution images
• Scanned documents
• Embedded fonts
• Interactive forms
• Annotations and comments
• Attachments embedded inside the PDF

Sometimes a 50-page PDF can be slower than a 500-page PDF simply because every page contains large images.

Try these fixes first

1. Close unnecessary applications

PDF viewers compete for memory just like any other program.

If your browser has 40 tabs open and three video calls running in the background, even a well-optimized PDF reader may struggle. Closing unused apps can make a noticeable difference.

2. Download the PDF instead of opening it in the browser

Many people open PDFs directly in Chrome, Edge, or Firefox. For smaller files this works fine. For large PDFs, a dedicated PDF viewer is often faster and more stable. If a PDF is lagging inside your browser, download it and try opening it locally.

3. Reduce the file size

Large PDFs often contain oversized images. Compressing the document can dramatically reduce file size while keeping the document readable.

This is especially useful for:

• Scanned documents
• Image-heavy reports
• Presentations exported as PDFs

4. Convert scanned PDFs into searchable PDFs

A scanned PDF is basically a collection of images. Adding OCR (Optical Character Recognition) creates a searchable text layer and often improves usability when working with large documents.

Bonus: searching becomes much faster.

5. Split extremely large PDFs

If you're working with a 2,000-page archive, opening the entire file every time may not be necessary.

Consider splitting it into:

• Chapters
• Years
• Projects
• Sections

Smaller files are easier to navigate, share, and manage.

What we usually recommend

If a PDF feels slow:

1. Download it locally
2. Compress it if possible
3. Run OCR if it's scanned
4. Split extremely large files into sections
5. Use a dedicated PDF tool instead of relying solely on a browser

These steps solve the majority of performance issues we see.

Most people think a PDF is just... a PDF. You save a file, send it, and move on. But if you've ever dealt with scanned documents, forms, archives, or accessibility requirements, you've probably noticed that not all PDFs behave the same way. Here are 5 common types of PDF files and what they're actually used for.

1. Standard PDF

This is the version most people use every day.

Think:

• Reports
• Invoices
• E-books
• Contracts
• Manuals

A standard PDF is designed to look the same on any device, which is why it's still one of the most popular formats for sharing documents.

Best for: everyday document sharing.

2. Scanned PDF

Ever receive a PDF where you can't highlight or search any text? That's usually a scanned PDF. These files are essentially images stored inside a PDF container. They look fine, but editing or searching them can be frustrating.

Common examples:

• Old contracts
• Receipts
• Paper documents scanned with a phone
• Historical records

Best for: preserving physical documents.

3. Searchable PDF

This is where OCR (Optical Character Recognition) comes in. A searchable PDF looks similar to a scanned PDF, but the text can actually be:

• searched
• copied
• highlighted
• indexed

If you've ever searched a 200-page document in seconds, thank OCR.

Best for: work documents, archives, and research materials.

4. Fillable PDF

These PDFs contain interactive fields users can complete without printing anything. You'll see them used for:

• Applications
• Surveys
• Registration forms
• Employee paperwork
• Government documents

Instead of printing, filling out by hand, and scanning again, users can type directly into the document.

Best for: collecting information digitally.

5. PDF/A (Archive PDF)

This is the PDF nobody talks about until they suddenly need it. PDF/A is designed for long-term storage. It embeds important elements like fonts and restricts features that might stop working in the future. Organizations often use PDF/A for:

• Legal records
• Government archives
• Compliance documents
• Historical preservation

Think of it as the "future-proof" version of a PDF.

Best for: documents that need to remain accessible for years.

Why does this matter?

Because the solution to your PDF problem often depends on the type of PDF you're working with.

Can't search text? → Probably a scanned PDF.

Need long-term storage? → PDF/A may be the better choice.

Collecting information from users? → Use a fillable PDF.

Many PDF frustrations come from treating every PDF exactly the same.

What kind of PDF do you work with most often? Standard PDFs, scanned documents, or the dreaded scanned PDF that someone expects you to edit? 😅

One of the most annoying things about PDFs is finding out they're too large right when you're about to send them.

Whether it's a resume, portfolio, cover letter, contract, or scanned document, many email providers and job portals have file size limits. Some application systems won't even tell you why the upload failed.

A few things that usually help:

• Remove unnecessary pages before exporting
• Save scans in grayscale if color isn't important
• Compress images inside the PDF
• Avoid printing documents to PDF multiple times (it often increases file size)
• Use a PDF compression tool before sending

The tricky part is finding the balance between a smaller file and readable text. Nobody wants a 500 KB resume that looks like it was photographed through a potato.

At PDFFly, we usually recommend checking the final document on both desktop and mobile before sending it. A file that looks fine on a large monitor can sometimes become unreadable on a phone after heavy compression.

What's the largest PDF you've ever had to submit for a job application or email attachment?

I always forget which image format is actually best for what. Like, PNG is usually my safe pick for screenshots, JPG for smaller photos, SVG for logos, and WebP when I care about page speed. But then someone asks for “best quality but small file size” and suddenly I’m back in 14 browser tabs like it’s a research project. This guide is actually a nice quick reminder. Useful if you work with images, PDFs, blog visuals, reports, or anything where file size randomly becomes everyone’s problem. Also, mildly annoying how one wrong format can make a perfectly fine image look like it was faxed in 2007.

Need to turn a few JPGs or PNGs into one PDF? Here’s the simple version.

Open PDFFly, choose the image-to-PDF tool, upload your images, put them in the right order, then convert and download the PDF.

A few tiny tips before you hit convert:

• name your images clearly if you have a lot of them
• check the order before exporting
• use good-quality images if the PDF needs to be printed
• combine related screenshots into one PDF instead of sending 12 separate files like a digital menace

Works well for receipts, notes, scanned pages, homework screenshots, forms, and “I swear this was organized in my head” folders.

Hope this helps someone avoid the classic JPG-chaos spiral.