DEV Community: chenmuxing

How to Extract Pages from a PDF Online

chenmuxing — Sat, 23 May 2026 15:46:29 +0000

Sometimes a PDF contains more than you need. You may have a long report, contract, invoice packet, school document, or scanned file, but only need a few pages from it.

The fastest solution is usually not to edit the original PDF. It is to create a new PDF that contains only the selected pages.

Quick method

Open a PDF page extraction tool.
Choose your PDF file.
Enter the pages you want, such as 1-3, 5, 8-10.
Download the new PDF.
Open the result and confirm the pages are correct.

You can do this with a browser tool like:

https://pdf-page-extractor.utilforge.xyz

It runs locally in the browser and does not require a server upload for the PDF.

Page range examples

Here are some common page range patterns:

1-3 extracts pages 1, 2, and 3.
2, 5, 9 extracts only pages 2, 5, and 9.
1-2, 6-8, 12 extracts several sections into one new file.
5, 1-2 exports page 5 first, then pages 1 and 2.

The last example is useful when you want to reorder a few pages while creating the new PDF.

When this is useful

Extracting pages is helpful when you need to:

send only the signed page of a document
save a few receipts from a larger file
separate a form from a document packet
pull one chapter or section from a report
share only relevant pages with a client or teammate

Privacy note

If the PDF contains private or sensitive information, think carefully before using any tool that uploads the file to a server.

A browser-based extractor can be a good option for everyday files because the file is processed locally in your browser session.

For highly confidential, legal, medical, or financial documents, a trusted offline desktop app may still be the safer choice.

Final tip

Always open the downloaded PDF before sending it. Check both the page count and the page order. A quick review prevents accidentally sharing the wrong page or missing an important attachment.

How Many Pageviews Do You Need to Make $1,000 per Month from Ads?

chenmuxing — Sat, 23 May 2026 13:11:52 +0000

The number of pageviews needed to make $1,000 per month from ads depends on RPM.

Use this formula:

target revenue / RPM x 1,000 = required monthly pageviews

If your target is $1,000/month:

At $5 RPM, you need about 200,000 monthly pageviews.
At $8 RPM, you need about 125,000 monthly pageviews.
At $10 RPM, you need about 100,000 monthly pageviews.
At $20 RPM, you need about 50,000 monthly pageviews.

That is why two sites with the same traffic can earn very different amounts.

Why RPM changes

RPM can change because of:

niche
visitor country
ad placement
device mix
content intent
seasonality
advertiser demand
traffic source

Commercial topics often earn more than general entertainment topics, but there are exceptions.

Why traffic quality matters

Not all pageviews are equal.

Search traffic, social traffic, and direct traffic can behave differently. Visitors from different countries may also produce very different ad revenue.

That is why someone else's RPM screenshot is not a reliable forecast for your site.

Quick calculator

You can test your own assumptions here:

https://ad-revenue.utilforge.xyz

Change the RPM and target monthly revenue to see how the pageview goal changes.

Final thought

Ad revenue can work, but the traffic requirements are often higher than beginners expect. Run the math early so your content goals are connected to realistic revenue scenarios.

How to Convert Valorant Sensitivity to CS2

chenmuxing — Sat, 23 May 2026 13:07:18 +0000

Valorant and CS2 do not use the same sensitivity scale, so copying your Valorant sensitivity directly into CS2 will not give the same aim feel.

The better way is to convert through physical mouse distance, usually measured as cm/360.

You need two numbers:

your Valorant sensitivity
your mouse DPI

From there, you can calculate how far your mouse travels for a full 360-degree turn, then find the CS2 sensitivity that produces a similar distance.

That gives you a much better starting point than guessing.

For example, if your Valorant sensitivity feels comfortable because it gives you a certain cm/360, the goal is not to copy the Valorant number. The goal is to recreate the same physical turn distance in CS2.

You can use this converter:

https://sensitivity-converter.utilforge.xyz

Choose Valorant as the source game, enter your sensitivity and DPI, then choose Counter-Strike 2 as the target game.

The result should be treated as a baseline. You may still need to adjust slightly because Valorant and CS2 differ in FOV, movement, recoil, scoped behavior, and general game feel.

The practical workflow:

Convert your sensitivity.
Load into practice range or a workshop map.
Do a few 180 turns, flicks, and tracking movements.
Adjust by small increments if it feels slightly off.
Keep the final number consistent for a while before changing it again.

The math gets you close. Your hand still gets the final vote.

How to Add Rounded Corners to an Image Online

chenmuxing — Fri, 22 May 2026 16:52:49 +0000

Rounded corners can make a screenshot, avatar, product image, or blog graphic feel more polished. The effect is small, but it often makes an image fit better inside a modern website, presentation, or social post.

The easiest way to add rounded corners depends on what you need next.

If the image is only going on a website, CSS might be enough:

img {
  border-radius: 24px;
}

But CSS does not create a new image file. If you need to download and use the edited image somewhere else, you need a tool that exports the result.

That is where a browser-based image tool is useful.

Quick method

Open https://image-corners.utilforge.xyz
Drop your image into the tool.
Adjust the corner radius slider.
Add a border if the image needs separation from the background.
Choose transparent or solid background.
Export as PNG, JPG, or WebP.

PNG is usually the best choice when you want transparent corners. JPG is fine for photos when transparency does not matter. WebP is a good modern option for web use.

When rounded corners help

Rounded corners are especially useful for:

app screenshots
landing page images
product documentation
blog graphics
avatars
social media posts
thumbnail images

They are not always needed. If the image already sits inside a designed frame, extra rounding can look redundant. But for raw screenshots, a little radius and padding can make the image feel more intentional.

Border or no border?

Use a border when the edge of the image blends into the page. This often happens with screenshots that have a white or very light background.

A thin gray or muted color border is usually enough. Thick borders can work for social graphics, but they often look heavy in documentation or product pages.

Transparent vs solid background

Use transparent background when you want the image to sit naturally on different page colors.

Use a solid background when you want a consistent card-like image, especially for social media, slide decks, or thumbnails.

Final tip

The most natural-looking rounded corners are usually subtle. Try a radius between 16px and 48px for normal screenshots, then adjust based on image size.